Bottle fed babies do tend to stop feeding at night earlier than BF babies though OP, so there's every chance your LO will stop feeding in the night around the 3-4 month mark.
A quick straw poll of my FFing mummy friends shows this is about average. Although there's always an exception: one friends little girl is still having 2 bottles in the night at 11mo.
I would say hang in there for a few more weeks and she will likely drop the night bottles (or most of them) in the next couple of months.
I think what helped my DS drop his night bottles was:
- offering him lots of milk during the day! Would offer a feed every 3 hours during the day at least. And feed on demand during the day, don't try to stick to a set schedule - every time she is hungry stick a bottle in!
- weight: agree with the poster above who said that they need to get to a certain weight/size before they can go long without a bottle. So you just have to ride it out.
- around 10 weeks my DS started doing a good block of sleep from around 8pm - 2am. After 2am he would wake up a few times and be quite unsettled and windy. So I would go to bed at 8pm as well and make sure I got a few good hours sleep before the fun and games began. Could you do this too?
- around 12 weeks we started offering a dream feed at 10.30pm....so baby would have bottle at 7.30 and in to bed for 8. If we left him alone he would wake up for a bottle around 1am or 2am. If we crept in and gave him a bottle in the dark at 10.30pm (lift out of crib, bottle in, gentle wind, put him back down without really waking) he would then sleep from 11pm until 4am which was better than nothing!
Someone once told me that if you can get a 4 hour stretch of sleep somewhere in 24 hours you will feel much less hideous!
Lastly please don't panic your baby won't be like this forever! There's a lot of talk on MN about how it's very common for babies to wake several times per night until a year or older (which is not what you wanna hear right now!)...I can honestly say this hasn't been my experience nor that of most of my friends. The first 3-4 months are chaos but then it rapidly improves.
Hang in there: the worst bit is almost over!