Sounds like my DS...he was a shocker and rarely slept...day or night... (He still has issues now unfortunately) I was lucky if DS would sleep for 20 minutes during the day and he woke maybe 6 times a night for a feed still (every 2 hours) for months. I know that doesn't make you feel any better but eventually it does get better...it may take a while though.

Personally I don't agree with leaving a tiny baby crying for too long, and even now we do 2, 4, 6 and sometimes 8 minute intervals for our DS (he's 21 months)...but I understand that everyone does what they feel is best and what they can cope with.

The only suggestion I have is that maybe she has bad wind and/or reflux problems (I'm a 'pro' dealing with those unfortunately)...with DS it certainly caused problems with his sleep and he just wanted to be held upright all the time.

Anyway, good luck and I hope it improves soon for you.