I started out (when DS was about 4mths old) with 60ml lots as I freeze milk in 30ml lots (when I have excess EBM) and soon after CC let me know that it was probably a little bit too little for him; sometimes he would go through a bottle and a half for a feed so I upped it to a 90ml bottle which is where he is now (at nearly 8mths) and has stayed at that volume since about 5mths.
He currently takes 4-5 bottles to CC and drinks 2-3 most days, some days 4 bottles, usually get to take one home, which ends up being his first bottle the next day - DH is a SAHD 2 days and we have CC 3 days a week.

ETA - they (CC people) will soon work out when your DD is hungry and feed accordingly. My DS has no feeding schedule (demand fed mostly - set times for solids at CC and is coping beautifully with that) and CC has done well with feeding DS - he definitely hasn't lost any weight If your DD gives you some cues about when she's hungry let CC know so they can look out for these to make it a little easier on them (particularly at the start)