Hello babsie,
I suggest it's better to post follow-on questions like this by posting them as responses under the original question. That way it's easier to follow the whole thread.
If the aim is simply to leave you the property them the easiest thing is to leave it to you in her will.
If she were to transfer the house to you would she still live in it? That can get messy. I suggest you use a solicitor.
I also think it will be seen as disposing of capital either to boost state benefits or to reduce/avoid contribution to care home fees. I don�t see that the fact you are not a relative is relevant.