Sorry she hasn't responded, Scorpiosis. She's always been such a loving, consistent presence in your life, but I do know that serious/life threatening illnesses can do strange things to people and how they handle their life following the diagnosis. It can be a difficult and unsettling wake up call about how you want to handle the rest of your life. I'm not saying that's what's going on with your therapist, but it's a possibility.

I think it's fine if you call or text or email her as a follow up to your email asking for an update. It's the least that she owes you after she promised to stay in contact when and if you contacted her during her sick leave. If she's decided to not continue practicing, you deserve to know this so you can go on with your life in regard to your own therapy. The sooner she gives you some indication the direction she's going, the sooner you get to move on.