Not having had this problem but do have a daughter and whilst I agree with all thats said,seems to me that it is Michelle who maybe should be the one doing the reassuring and spending more time with daughter. Apologies if that has been done and I missed it. I guess if her and mum where together without a male for some time before you two got together it could be a jealousy thing too, that mum gets all this attention and is busy planning her special day, new clothes etc,even daughters get jealous of mum being centre stage. Just a thought but it is a fine line to make her seem special too and it looking like bribery.
I,m sure it will blow over so loving but boundaries and a united front at all times.
Congratulations btw.