I would take her to a piercing studio if you are going to let her get her ears pierced.
I am not sure if you should or not, I would only piece my child's body if it was their choice of course but at what age are they able to make those types of decisions? There is more to it then the initial pain, they also need to be cleaned a few times a day until they are healed and if they get infected they can hurt a lot. Would she be able to keep dirty fingers off of them until they are healed?
When I was a kid I wanted my ears pierced when I was about 3 and so my mom took me to have them done at the mall (without telling my dad, he did not want me to have my ears pieced) Well the women got one ear done and It hurt way more then I ever imagined and it burned and I started to scream and wouldn't let her near my other ear. My mom had to take me home with one ear done and well my dad was not pleased. That piecing got infected and got really sore and pussy (I would freak when my mom went near my ear so she had a hard time cleaning it or being able to take it out). Anyway when I turned six they were done again and they got infected a few times again. This repeated for many years. I have never had a piecing done that did not get infected at least once during the healing process (I have had piecings done by guns at hair salons

and by needles at piecing studios) Anyway just some food for thought.
I think if it was me I would take my LO to a piercing studio and have the piercer show her the equipment and explain what he/she will do to pierce the ear. I would probably even go as far as to get my ear pieced again to show her the procedure.