I'm assuming a gentle effort to deflect the conversation to something else like work, school, her day, the weather, dinner, or the aliens that landed in Roswell already failed

... .so here's the next step:
"I can't listen to this now."
Or better yet:
"I won't listen to this now."
You don't have to identify it as abuse. You don't have to identify it as criticism or blame. You don't have to identify it as unfair or unkind to you. (You could identify it... .but that is a bit dangerous, as she can then try to deny that she's doing whatever you are describing, doubling down on the invalidation and criticism, which is the exact opposite of what you want!)
You don't have to make it a "never again" thing--In fact you will find that some times you can listen to these things and be constructive and perhaps compassionate about them... .and other times you just don't have that in you.
Make it about yourself, and how you are feeling right now. And not up for negotiation.
... .And if she responds by escalating the blame/criticism, or criticizing you for not being there for her when you try to get her to stop, or whatever... .you just have to take your boundary enforcement up to the next level and remove yourself from the conversation / remove yourself from her presence.