EDIT: Ty all for your input, will just ignore her.

Ex coworker, that had a crush on me I think and I had drinks with once but didn't escalate due to too many red flags and her being my coworker.. has much later screwed me over in a dispute with my boss when she backed his lies instead what really happened infront of my bosses boss resulting in me being fired.

I haven't had contact with her since the day when I was fired and I think she knows I consider her action as a severe betrayal. Anyway.. I don't care about her at all. But she reached out today to ask for my bank details as supposedly she still owes me money (I have no clue how much or why, I'm sure it's a sum that I don't care about) and I don't know how to respond or if to respond at all.

What would you do? I will never forgive her for her betrayal but I also think that engaging in any way letting her know that is beta as fuck. Should I just ignore her message? Would you respond diplomatically and give her the details so she can send that money and then break contact again?

Thank you for any advice.