Awe, I am so sorry you're stuck without her while you're dealing with some heavy material, plus you've got the worry that she's struggling too and might not even be back.

I think you're right that you are catastrophizing and more than likely she'll be back and ready to help as soon as she addresses the situation at home.

Do you have any favorite things you like to do that you might indulge in while you wait to hear back? Any ways you find good for getting lost for a bit?

It's a hard trick to pull off, but if you can just tell yourself that the fact that you are struggling and want her help is totally acceptable and that you deserve help and compassion, and believe it, it will help the frustration. Then you can focus on helping yourself where you are, instead of wishing you were different which won't get you anywhere but worse in my experience.