First of all, congrats on your new baby girl! Sounds as though you're doing great so far! DD only fed from one side at a time until around 3 months. I'd continue to offer both sides. If she wants it, she'll obviously take it. If she doesn't and you feel full on one side, try expressing a little until you feel comfortable. This will help prevent blocked ducts, mastitis etc.

You might find that your supply will settle down around 4-6 weeks once your body figures out how much to make for bubs. From then she might need to feed from both sides.