I would distance yourself from her! Make it difficult for her to get in touch by blocking her calls etc.
Sorry if that sounds harsh, but you have quite enough on your plate just now and you can really do without a friend who is as self-centered as this woman sounds!
I have cut off/distanced myself from several friends and even a family member recently! My husband and I were forced into bankruptcy in 2012, through no fault of our own. We now live in very much reduced circumstances, which has seriously affected my mental health! Some of my so-called friends, and even my own daughter, who has a rich partner, constantly go on about the things they have bought, the several holidays a year they take etc etc, knowing full well how difficult life is for me and my husband!
Some folks will say I am just jealous, and while that's probably true, I didn't expect to end up having the life I have after a nursing career of over 30 years! Both my husband and I had to retire early due to poor health, so there's zero chance of us increasing our income! My daughter and her partner even view us as Benefit Scroungers as we have been forced to claim disability benefits just to survive! Other friends have made indirect comments that the taxes they pay are supporting the likes of us!
I have suffered very badly with depression since the bankruptcy, and have even been hospitalised following a suicide attempt! So now, I can do without people who make me feel useless and inadequate! Only you can make the choice as how to deal with your friend! Good luck, whatever choice you make! Also, sending hugs to both you and your husband - dealing with ill health as you get older can be very challenging and stressful! xx