Rosecomb is dominant but if the parent only had 1 copy of the gene, the result would be 50/50 rose combs and straight combs. (this is what I got from another thread where Sonoran Silkies explained it) So, yes there is a chance to get a rose comb. Straight combs will be small or wierd looking. White lobes could mean mixed with rosecomb or dutch.. but dutch have huge combs so, unless she grows a nice sized comb soon, I would say rosecomb mix.