Keep in mind, she's venting to a friend. She probably has good days and bad days and it's possible she may even feel like she needs to justify to this elder boyfriend why she's staying with you.
I have done the sneaking into other people's writings in the past (my mil lived with us for several years and was abusing valiums) and ya know the one thing I learned is this, sometimes we write to just get something out. We vent, we bitch, we whine and moan. And then we feel better and we move on.
That being said, I am not a fan of parents living with their childen. I know, I know there is this huge thing about how adult children should take care of their elderly parents. This can be done without the parent living with the child and his/her family.
My MIL now lives in a nice apt. It's part of the housing through the state. How much she pays is based on how much (or little) she receives and is determined at the outset. More than likely the state where you live has a subsidized housing. Also, if you have siblings of any age, it's important that they understand that her care is not your sole responsibility.
good luck