@Rokubox
What your DD did technically is indeed assault, but I belive your wife is more angry about the humiliation in front of her family rather than the assault, that in itself isn't necessarily a unreasonable feeling even years later in my opinion
But!
Fact is you destroyed the family you had with her, sure your DD was 22 at the time, but fact is they didn't meet for 4 years, barely talked for 5 months, and then had an argument, it's just my assumption, but I don't think most peoppe would simply throw the water for no reason, especially since your daughter was trying to build bridge, am I wrong to assume your wife tried to give too much opinion as if she gets an actual saying on your DD life? I belive that would piss any child who had their family ruined.
Even if we just take the situation like this it's still too much to hold this grudge for 7 years when your DD position was pretty understandable, I belive most reasonable adult would be angry for a while, understand her side, and eventually let it go.
I feel the real problem is the part I'll write now, and I do hope the people taking the wife side takes a minute to think about what I'll say.
Any child will have a extremely hard position if their parents cheated and ruined the family, fact is besides what I explained above, your daughter was struggling with possible suicide, with depression, probably still is struggling with depression really, was fucking sexually assaulted and had an abortion, I'm honestly surprised she even tried to build bridges when she was going through such extremely rough time.
I feel any reasonable adult would see how she's at a extremely vulnerable time and would simply let the issue go, yeah your wife was humiliated in front of her family, but your daughter was already vulnerable and I sure as hell don't see her lashing out unless she felt attacked or threatened by you wife when she was already hurt due the SA.
But of course all these situations can go to any direction depending on the people involved, I feel what really puts me against your wife is that it's been 7 years and she's still holding that grudge.
Let me put it like this:
DD - might attempt suicide, depression, abortion
Wife - water throw at her and humiliated in front of her family
The fact that it's been 7 years and she's basically "me me me I was assaulted!" while your DD at the time was SA victim tell me everything I need to know about your wife.
Yeah, your wife technically was assaulted and your DD never apologized for that, but she acting as if she's a poor victim of assault when your daughter literally suffered SA is pathetically selfish and self centered from her, I'm surprised your daughter still tried building a bridge even if it's 7 years later since she has all reason to hate you and your wife.
Also, you're always going to be a parent first and foremost, your duty to your children always should come first, you have to accept a relationship between you DD and wife might simply not work since your wife is so petty as to hold a 7 year grudge against a 22 year old, which for many would still be considered a child, everything else just makes your wife a even worse person.
If you have children with your wife then don't involve your DD with you yout wife if things continue like this, if you don't have children with her then your DD is your priority, you're trying, she's trying, only your wife isn't trying, which side to choose is pretty clear in my opinion.
Sorry the rant (ノ´д`)