I did not get a chance to read all the responses, 2tp... so I'm posting blind, here...

I do know there are many who say enforce your boundaries (which is true) and let her miss you (which MIGHT also be appropriate)...

thing is...

it's NOT our job to teach them a lesson... life will do that...

If your name is still on the house...

And she IS asking you...

Why not?

To teach her a lesson...?

What lesson will YOU learn... by teaching her a lesson?

Or... can you just let the past go and do it because you say you enjoy that type of work...

so you don't live there... so...?

Would you do it for a friend?