At 5', I'd look for a vintage rigid mtb. They tend not to be expensive and the 26 inch wheels are a big, big plus in your case. You'll get a small bike that rides right. I wouldn't get this because it has a front suspension fork but the very first mtb listed on the LA CL has a 13 inch frameset:
http://losangeles.craigslist.org/sfv...981462921.html