She can petition you. In order to be siblings you only need to share a single parent (step siblings a bit more tricky).

Expect a long wait time.

You won't be able to adjust on this petition unless you're covered by 245(i). You might be able to seek a hardship waiver if you have a USC/LPR Spouse/Parent.

Might be faster for an LPR parent to petition for you in F2B however.