Hi there
I'm a bf mod - so I'm just going to focus on that side of things if that's OK. Calum's mum asked me to drop by.
Well done for keeping up with the breastfeeding. I know it's tricky when your baby has had a long stay in hospital. It is hard work building your supply back up because you've missed those first few weeks of feeding that help build up your prolactin hormone (the hormone that governs milk supply). It's great that you are giving her breastfeeds even if they are only short ones as that will help with your supply - the more time she's on the breast the better. If you do want to move towards more breastfeeding then I might suggest you think about using an SNS system (lact-aid is another brand). This is a product designed to help mothers who want to build up their supply or relactate or increase the amount that they are breastfeeding. It enables you to supplement her feeds with formula or expressed breastmilk while she is still feeding at the breast. You might need to take a look:
http://www.kellymom.com/bf/supply/adoptivebf.html#comparisonThis link is about comparing SNS vs lactaid and has some photos. It says 'adoptive' because they are often bought by women who have adopted a baby and want to breastfeed. I think this is worth you thinking about because it will help maintain your own supply as she is sucking at your breast. She gets breastmilk at the same time as supplementing. It would also help her work on her sucking technique as she gets older (because as you know a bottle is a completely different technique).
You might want to also think about using a breast pump to help build up your supply and you can pump at the end of feeds to increase the quantity your breasts make (it's all demand = supply).
A 3 hour EASY is tough for some 'newborns' which she effectively is. Many mums on the bf board start with a 2 -2.5 hour feeding cycle. Some mums of newborns aren't able to keep their LOs awake at the breast so take a few weeks before EASY can be established. I think the main thing is that if you are committed to EASY you could work on developing her ability to fall asleep 'independently' if that's what you want to do and as she is able to stay awake more then EASY will be easier to establish.
With regard to night feeds - If she's only waking 2 or 3 times and you feel she is genuinely showing hunger signs then I would feed her. If you feel she's waking up more than that and is just using the feed to help her get back to sleep and then takes very little then I would use other methods. With a 7lb baby with her history I wouldn't advocate you 'hold her off' if she's clearly showing she's hungry. With breastfeeding you don't want to completely miss her hunger cues or your milk supply will not develop to meet her needs - especially during a growth spurt. Even if you weren't breastfeeding at all I wouldn't suggest you hold her off if she is showing she's clearly hungry at this point.
If you want more help with bf visit us on the bf board. On the FAQ page there are numbers for helplines and the la Leche League. They could tell you more about using SNS and the advice is free.
HTH