I have 3 girls. They are in Grades 7, 4 & 3.
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The one in Grade 7 is the child who is friends with everyone in her class. She's in middle school now & there are 6 or 7 Grade 7 classes instead of 2 but those in her class she is friends with & gets along with them.
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She has always had a "best friend" and every single one of them has moved away each year.lol Seriously every year, including kindergarten, her BF moved away at the end of the year.
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She has other friends she hangs out with, 2 girls who she's gone to school with since they were 3 & in playschool. She has other friends she sometimes hangs out with after school but I don't like those friends so I do not encourage friendships there(without me actually doing anything).
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Her best/best friend though would actually go to a different school. She moved after Grade 3. They would call & invite each other to their birthday parties & that was the only time they saw each other until Grade 6. When my dd went back to Judo when it started up in the fall her friend was there, she didn't know my dd was in Judo. They now see each other twice a week at Judo, we've taken her to tournaments & such. They sometimes see each other outside of school/judo. They call/text each other alot.Â
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In 2 more years they will be in the same school again unless they build another school by then but i doubt they could get one done. My dd has expressed some interest in trying to get her transferred to that school for middle school but that school is even more overcrowded than hers & they do not like to transfer kids into that school though I will be working at that school & could get her transferred because of that. She is making good wholesome connections & activities in her present school & I'd hate to take that away from her too.
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 Even though she doesn't have a best/best friend that she's had since Grade 1/2 she has her 1 friend that she's been in school with since playschool that has always been a constant person for her. She doesn't complain either. She sees what some of these other kids do & how they act and doesn't want to be like them.
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Alot of these little groups have the same interests & their families are friends so they hang out on weekends, in camps, etc. IE, 1 group are all horse riders/have ranches.Â
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My youngest kid has her group of friends she hangs with. It hasn't changed much since Grade 1. In Kindergarten her best friend moved away, she was heartbroken over it(my oldest never has been). Since then her group has been based a little on who is in her class. There is a group of them though(3) that all dance together so they have that connection while at school too.
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My middle one though, oiy. She has her group & it is a big group of about 12 girls. Unfortunatly there is 1 girl in that group that likes to cause alot of problems amongst them.  Her & my dd do not get along but this girl tries to drag the other girls away from my dd & 2 of the other girls & tries to cause problems amongst the other girls so they won't be friends anymore. I can't wait until middle school where hopefully this girl will move on & find other kids to hang with that are up to her standards. So within the big group are smaller groups too. My dd has 1 girl she considers her bff & vice versa.  Almost all of the girls dance, but in 3 different studios though 1 of them may be transferring to our studio next year. These girls have all been friends since kindergarten/grade 1. The only thing that has changed is when the bossy child moved into our school & then 2 cousins moved in last year & this year making the group bigger.
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So all of my girls have 3 different types of friendships. Will they all last, doubt it. Is it better to have a small group of really close friends or a big group of friends, depends on the person.
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What matters the most is how does your dd feel about it & is it causing any issues.
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Sometimes it is hard for kids to break into a group. If you would like your dd to start breaking into these groups find out what happens when you aren't there. Make playdates outside of school with these girls.