I don't really think there's a lot you can do til she's happy. But don't feel guilty about getting on with your life!
I've said in previous post about my friend the deserted me when i got pregnant. She'd text me occasionally til she got the text saying Angel was here. Not heard from her since. Everything has been a competition with her though. GCSE's, i got my bloke, moved in then had a kid. Before i got pregnant she said she was getting engaged on her 21st, but then i announced i was pregnant she was miffed coz she 'couldn't afford both'.
I get on with it coz thats all i can do. I can't wait til she gets there 1st.
Make yourself happy.