We had Charlie's bassinette mattress elevated for the first couple of months, as he seemed to need it, in hospital he was in the isolette until the week before he came home ( long story, he was infectious so instead of an isolation room, he was in the isolette )and the mattress was always elevated.
We couldn't stop cuddling him, but realised in the first few days that the nurses had given us a wonderful gift of teaching him to self settle and put himself to sleep because of being in the isolette for so long and not being able to be held to go to sleep. We had to be really strict with ourselves and keep that routine going, making sure to put him down to sleep when he was still awake and not letting him sleep for long periods in our arms. It was tough, and we weren't always successful but as a result he is a GREAT sleeper, has been sleeping through for the last two months from 7 - 7 and a couple of day sleeps too.
Also we have a 'noise maker' a little sound system that makes noises, including rain which sounds like the air coming through the low flow tubes! Noise is a great thing for a prem baby, they aren't used to being in quiet places. You will certainly see the benefits of that as you go out and about more and realise she can sleep through ANYTHING
Try and pesevere with the self settle routine, if they can learn to put themselves to sleep, it makes is sooooo much easier when they are older and put themselves back under when they stir in the middle of the night.
Congratulations on your tiny bundle of joy, the heartaches & feeling totally ripped off does start to fade, although I never thought it would, and your litle one won't be tiny for long, our 'skun rabbit' is now a whopping 7.6 kilos!