I had a similar situation with a friend of mine who, like you, I had known for ages.
I got married, had kids, divorced, remarried and took on SDCs.
She remained in the same job, with the same semi-attached partner, all this time - as in, no major life changes.
Our pattern of getting together (we lived in different cities and she travelled a lot for work) was one that suited us well to start with, then got difficult, and then very onerous as my life circumstances changed. I kept trying to explain it to her, but she just didn't hear. Or didn't want the arrangement to change (it was one that massively benefitted her) .
In the end, it was her inability to hear what I was telling her, and modifying her behaviour in response, that meant the friendship ended.
If you've been trying to explain to your friend for years that you don't have the bandwidth for this intense style of communication and want it to change, and she is not hearing this.... 😩
As you put it earlier, why should her 'want' trump yours.
In the end, you either keep doing what you've been doing, and go with her want.
Or you go with your own want - put boundaries in place, enforce them, and absorb the consequent scoldings. But it sounds like you're gonna lose the friend anyway if she doesn't rein it in.