Does she have an earache??
I think that you can just offer as often as you like, but be prepared for a "no".

As far as the night feeds are concerned, I found that by feeding mostly to sleep and then rolling over and letting DS cuddle my back as he does the last bit of going to sleep he became much less dependent on boob to settle, and now spends most nights in his cot with only one wake-up.

And congrats on your anniversary - to both you and Miss Caterpilla!