You should have a neutral reaction to biting and hitting. Stop her, but otherwise act lke nothing is going on. Having a no no no reaction or mad face can reinforce it and make it fun for her to do it more, thus increasing the behaviour not reducing it.
THEN, most importantly, draw attention to her when she is playing nicely and not biting/hitting. Like "Wow, you're playing nicely with your friends!" + big smiley face and voice.
I think she's too young for all of this, really, but it's better than setting up a frustration/negative attention cycle now. You should not be "disciplining" her. On the other hand, the technique above will help to encourage her to be social, without it being punitive.
As for toys, there's nothing you can do. They just do this at that age. You can take it back and say "let's share" or soemthing, btu she won't get it until much much later.
(HarperCait- ABA Behaviour Therapist)