It's not too much to ask, if you ASK.
Here's the thing, you are in charge of how other people make you feel. If you don't like the way something is playing out, you have the power to change it. Why is it too much to ask of you to contact her? She could have lots of reasons for not contacting you, from not wanting to waste the charge on your phone (you did tell her that you were charging it at a coffee shop, yes?) to not being aware that you didn't have a place to stay, to not feeling comfortable with leaving someone else in her house while she was away on a planned vacation. Some people just aren't naturally inclusive, or they feel as if they would be prying into your affairs too much to mention it. Hell, it might even be like Miss_Conduct suggested: she may not be prepared for that kind of a lifestyle change, or she might have had a bad experience with a houseguest who overstayed their welcome before. The reasons are as varied as poeple are and none of it matters. If you really want to know, you have to ask her, speculating with us will get you nowhere