What’s the meaning of this?

When my ex ended things she wanted to remain friends but I choose not to.. she seemed a little taken back by this and an argument broke out lasting on and off for a week.. it ended up in her blocking my mobile number.. I felt a little bad knowing I had upset her threw things I had said during the argument and wanted to apologise.. I used Facebook to contact her and apologise, she thanked me for my message and said she believed me… After the relationship ended she said she didn’t want to try work things out to realise again things won’t work she said she was terribly sorry but that’s how she felt but the friendship offer was on the table as she said it would be hugely beneficial to remain friends.. Since the blocking and the accepted apology Iv reached out twice just to see how she is and how she’s coping with her illness.. Iv received 2 polite replies.. After Christmas I contacted her saying hope you enjoyed Christmas etc Iv thought about things and I’m happy to remain friends should you still like this.. She replied back saying thanks for the message, hope your Christmas went well, yes/perhaps let’s stay in touch as friends, wish you a happy new year.. Can I ask what’s with that thanking me for the message? If she didn’t want to hear from me she wouldn’t be thanking me right? Why not just reply without the thanks for your message.. Was it like she was sitting around hoping or expecting me to reply? I understand she’s being polite by replying etc but thanking me for the message? Surly she wouldn’t say thanks if she didn’t want to hear from me? I’m not suggesting she wants to get back together but why thank me if she didn’t want contact from me?

Honestly, I think the bigger question is why did you contact her if she didn't want to hear from you? I'm sorry, but when she said thank you, all the thank you was was just generic words that people use when they are trying to be polite. When people decide they need to leave your life, let them. Let her leave.