Keep trying with the photos!!

Stop getting on the floor with her! You are totally freaking her out. She has no idea that people do that sort of thing!!! Get on the floor on your own with a book or a magazine and leave her alone to look at you, get used to the idea of people on the floor and she will adjust her view of the world at her own pace. It will not be long before she is relaxed about this and she will probably end up joining you, given time. It is important to show her that you on the floor has nothing to do with her so ignore her totally, no eye contact and do not speak to her. Once she learns that it is OK she will be fine. Let her approach you on the floor when she is ready.
Keep us up to date on how she is doing, please.