I'm 5'1" and haven't been that thin... not sure I want to.

But.. short people often talk about being short.. and so I know several women between 100 and 110 that are 5' or 5'1". I don't see that another 3 lbs lighter would hurt on a small frame.
However I do think it's more important to be healthy, the size you feel comfortable, and realistic.

I do think that is a realistic goal for someone so short if they are fairly small boned and most importantly are comfortable being there while still maintaining a healthy diet!!

Carina