I think if she makes an actual effort then it doesn't matter if we all despise her still. She'll have done what was needed. She'll have attempted to get along, to try with all of us. I seriously doubt it'll all be coming up roses after 3 months, Elijah. It takes so much more time than that. But I think you will be able to see if she's actually going to even make an attempt by then.
As for being disowned. Well. Okay, he might. He really doesn't like her. But that doesn't mean you lose everyone else. And well...just don't get married in 3 months and maybe if she actually works on stuff he'll...okay, he'll probably never come around in regards to her. But don't give up hope.