She has a straight comb, which would mean she's not a rosecomb correct? Even if she was rosecomb cross, shed have the rosecomb over the straight? She does look a lot like a rosecomb though!
I just checked and she does have white earlobes...
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.
I am going to say that she is a rosecomb x then. Her comb is tiny, and it kind of looks funny at the top. She is still quite young, but I can't see her "sprouting" a big comb any time soon