Please, can we elevate your legs??

I have a client who refuses to get out of her wheelchair and has been doing this since June. Last Friday, we talked about this issue and made a plan. She agreed to get into a recliner so she could elevate her legs daily for 1 hour. My part of the deal was to get her back into her wheelchair before I left for the day. Well, She got into the chair and everyone was so surprised... she looked so comfortable and even a bit relaxed. She sat there with her legs elevated while I went to post clinical conferences but when I returned, she was gone...today we talked about fidelity and I feel so guilt- riden. I did not look for her, I should have and I have to go appologize when I go back Thursday and try to regain her trust. It is not going to be fun or easy and I am worried but I do have faith that God will give me the words I need. She semms like she has been let down before and her guard is up so I have to try an break thru that so we can work together.