All of the above is very useful advice...just put yourself in her shoes and you will be guided by your own wisdom to do the right thing with her, day by day.
Let love and kindness be your guide.
One other thought that I haven't seen mentioned here...let her "help" you with something. Make her visit special and valuable in that way. Even while she is resting, etc., ask her advice on some simple practical things... ask for her help with an easy or fun project around the house, or to go shopping and pick out a new outfit, or???
This is one of the biggest emotional or psychological needs that I have found in those newly out or wanting out...
...to still be able to feel that they are fulfilling a good useful purpose in life, helping people, being useful, feeling needed, etc. This is vitally important to them, for their own self esteem and self image, to experience this in the real world outside of the Cult, asap after leaving.
Create some fun, non-stressful projects that the two of you can work on together, and be really grateful for her help. Let her see how much you value her presence in your life, how much you have missed her. Let HER help YOU recover from your bad experiences. Don't treat her like an invalid, or with kid gloves. Treat her as if she is very able and capable of helping you, and your community, and the world, and she will rise to the occasion, even as she is sorting out the confusion over her life and potentially leaving the Cult behind her, even if it's just in leaving staff or SO and being an "Indy" for awhile.
It's a big adjustment. Just mirror to her the emotions you would like to see in her, like calm happiness at having her visit you, and enjoyment of doing things together, like shopping, cooking and eating, watching a fun and uplifting movie, etc.
My perception (based on my own experiences with them) of folks who are in this kind of delicate stage in the process of reassessing their lives and commitment to the Cult, and pondering leaving, are that if YOU set the tone, they will with relief follow you, emotionally.
They are so used to being directed and led, they hardly know what to think or what to feel, or what to do on their own, left to their own devices...so you suggest a plan of action for the day, or part of the day, etc. with a couple of choices or choice in how to structure the day, but don't ask too many very open-ended questions like, "What would you like to do"?, "Where would you like to go?", as that may be too difficult a question...too many mind-boggling choices!
So gently lead and guide her choices a little bit, at first, and see how it goes. Give her some slight structure for her visit to work within, or set some easy to accomplish goals, based on her interests, or your real life needs. (Examples ~ Gardening, planting and weeding is very healing! So is shopping for food and cooking a good meal, and sharing it with a friend or neighbor in need.)
I think that will help her to feel more comfortably stable and secure, while she is testing the waters of being covertly "out" for awhile, while visiting you, and de-stressing a bit.
Also, don't over-react if she goes all clammy on you, spouting tech...don't argue or contradict her...just listen, and stay present with her in a caring way. You will have many chances to enlighten her and discuss things in the future. Don't be afraid to let things unfold, in their own good time.
That's my advice to you.
VERY happy for you and your family, my dear!