I was randomly messaged on Facebook by a girl, I replied, and we exchanged lots of messages. We then would chat on msn and exchanged pictures, then mobile numbers... we talked for hours over the phone. And text each other continuously every day... we then met up and stayed with each other for week... we continued talking and saying how much we liked each other, then last week I couldn't send texts to her mobile.. I waited till she had finished work then tried to call and got the message "incorrect phone number, please check and try again" I left it a few days then emailed her to see what was happening with her phone, but have not got a reply from her. I messaged her housemate to check she was OK as I hadn't heard anything, she said she had only seen her briefly a day or 2 before and was fine then... but I have still not heard anything.. its been 6 days with nothing, when we were contacting each other lots everyday...

and now I'm confused

I guess she is a player and wasn't really that into you. Therefore broke off contact. I would suggest leave it alone and see what happens and if nothing, move on.

Found out from her housemate that she not been back to there house since Friday, and is apparently staying at her mothers house, she also said that she has changed her mobile number but she's not given it to her and does not no why.

Whatever the deal is she isn't sharing it with you at this time. You can only hope she is okay and will call later, if not, don't trip on it. Time to move on.