yes but sinking sand is a bit easier to get out fom wheras quicksand acts too fast before you can get out your sucked in.
they have big and broad feet so its not difficult to walk on sand!
Snow shoes help, If it is too deep It is probably best to go another way.
Ask her why she is avoiding u would be a start Try to confront her directly; if she won't see you, write her a note. It is her choice whether to respond or not.