Oh no......! You & your mom must feel so scared...! My Zazou got lost twice last month, and it was so hard to take...! IN both cases she wasn't far away; she was in a shed of our back-neighbour.
In fact Denise told me where she was, she felt that Zazou was fine! Maybe you can ask her to do a reading? All she needs is a picture and some details about Misty! I will look up her website for you now and post the link here

Here is the link:
www.pawsitive-thinking.co.uk