hmm, I find sleep breeds sleep - decent naps stop them getting overtired, and overtiredness often contributes to restless sleep.
I'd suggest you try to eke out at least one night each when you and your dh sleep away from the baby. the problem with baby-related sleep deprivation is it is cumulative and relentless, to the point where yu can't think straight.
Have you considered sleeping with her in another part of the house (eg front room) so you're not so likely to wake your dh/fil? As a temporary measure, it might help the 'transition' if you want to gradually become less available at night,
On the bright side - it doesn't sound like you're feeding at night.
Dummies - my dd used to go to bed with half a dozen.
I used to put my dd down with a bottle of juice in her cot, that she could sip from at night. I'm sure there are lots of reasons why that's a no-no - but it is what we did
She's in your room, right? It may help if you think of all the ways you settle her, and try only to use the things that you can do on 'auto pilot' without waking up. So try to stick to settling her in her cot without waking her up. I found I developed the 'midnight dummy replacement reflex'
Much sympathy! Sleep deprivation bends the mind and makes the world go grey.