I am not one for chivalry but you can't go any lower than attacking an old, injured woman as a group. Also, it was nice of Ye Yu to offer his treasure to the senior. He has been generous lately.

Well, it was a smart move. He was smart enough to figure out a way to help the senior win and right now those invaders are too strong...so its win or die. Might as well give him the magic item.

I must have forgotten, but did they explain why the seal/curse is weakening?

It weakened when MC broke the seal in Sword Dynasty.

Oh

Wait i'm confused didn't she attack, and almost kill this man working with Mo Wash his face cause he got sh*t'd on by Ye Yu. Now she help'n them cause to redeem herself from a wrong she committed against them, or what.

shes helping the old ghost guy (who is her senior from like thousand years ago also she is the one in the geography map thats shown) not ye yu and also she helped mo wushang only for a deal they made it was seen talking about in previous episode