First, install the KotOR 2 Save Game Editior from the workshop, open it up.

You need to edit 3 lines, all of which are in the Globals, Numerics section.

The first is 000_Hand_Angry. If you made her mad this will be set to 1. Set this to 0 and apply.

However, just doing this won't solve the problem, as when this value is changed to 1 a series of values are then changed beyond that.

The next value you should edit is 000_Hand_Finale. It should be set to 1 if she's angry, because when this is set to 1 she won't talk to you and this (I believe) affects the endgame. Set this to 0.

The last value you need to edit is 003EBO_Visas_Hand. For some reason mine was set to 3. Set this to 0.

By the way, this happens because your influence with Visas is much higher than Handmaiden's so you might as well go into the NPCs section, find Handmaiden and raise the influence while lowering VIsas', just so it won't do it again.

Commit all the changes and that's it. It took me a really long time to figure all this out so I thought I'd make a guide.

Source for KSE Values here[deadlystream.com]