Well at least she still values your opinion. But I'd leave it there. IMO the "I can afford it" is, as you said earlier her in the frame of mind that you are no longer a couple. Well ok. But was it her money? I mean did she earn it herself? If so then fine. She can sped her own money any way she likes.
But what was the reason for being frugal at Christmas?
Me:43 Her:42 M:14 S:9 EA started 2014/03 (or there abouts) PA started 2014/05/30 BD:2014/11/05 I left 2015/10/01 I returned 2015/05/02 She left 2015/06/10 OM still on the go.