Been there, sorry to say but most MIL are hard on there DIL. Have no clue why. They sure like to fark up someone's marriage from the get go. I know not all are like that. It sure makes marriage easier when everyone gets along. Never was blessed with that. My in-laws have always thought I destroyed their sons life. We will be married 32 years the end of June. MIL has passed, but FIL still hangs on to those threads.
It was the other way round for me. With Scott being 14 years older than me and I will admit he was a bit naughty in his younger years everyone said it would end in tears. My family came round in the end and we have been together nearly 17 years now. Proved them all wrong and we are happy family.