Woundedone......I agree with the other. above posters....that your thinking is correct.
It is not surprising, though, that she would contact you. Grabbing on to the closest, convenient person to increase dopamine levels in their midbrain and distract themselves from the real heaving lifting that true and lasting recovery requires. the fast and easy Feel Good.
As you recognized.. it is selfish and self serving. About her needs and not about your overall welfare, at all.
It will be your job to look out for your own welfare, because she can't or won't.
If you let yourself get sucked in....when the hurtin' time comes, again....and, it surely will....you will be the one hurting...not her......