My understanding of the way the mosaicism works is, the chance of you having a daughter with Turners syndrome depends on the chromosomal makeup of the cells in your ovaries, and whether the egg that becomes a child happened to come from a group of cells with normal chromosomes or not. Ie very very hard to predict. You might ask your OB for a referral for genetic counseling, to see if a specialisy can give you any more info. If you've already had two kids, it sounds like the Turner cells have very low penetrance in you, so maybe your chances are good; but I think it's impossible to predict.
Having one or thousands more should be ur decision not someone else so dont let other persons make u fell bad.You are a beautiful mom and noone can't chanhe that also God knows what is inside ur heart so stop killing yourself,and if the girl comes just pray and try to make sure she have a beautiful life anyways as u said you have lived a very normal and healthy life so make your decision thinking in what u wanna ...why u sould care about someone else blaming u for no reason...u are a goos person thats what really matter..