If she's used to feeding all night at 7 months I think it's a bit tough to go to no feeds at all - especially as a night feed at this age is still pretty common.
I would probably suggest one of two approaches - either do a late/dreamfeed at 10/11pm and then don't feed again until 'morning', say 5am. Or pick a time period, say 4h (which you can gradually increase) that you will not feed before. So say she has a BT feed at 7pm, you don't feed at any wakings before 11pm.
The important thing with either method is that you decide BEFORE you go to LO whether it is a 'feed' or 'not feed' waking. What you want to avoid is doing PUPD for 2 hours then giving a feed because it's feed time. If LO wakes and it's not feed time, use PUPD until LO sleeps, however long it takes and even if it takes you past feed time. LO only needs to go to sleep for a short time, and you can feed on the next waking. You're just trying to avoid the situation of 'I scream for long enough = I get fed'. Does that make sense?
Hope that helps
