Absolutely fine! Even with bottle feeds you need to feed on demand and let them take what they need. There should be a bit left in the bottle so you know they stopped because they were full and not just because the bottle is empty and if they are draining bottles you need to add another oz. The only time to worry is if they throw the feed back up as soon as they have drunk it, but if she is keeping her feeds down ok then it's fine!
Congrats on your new LO!
Laura