There are only 3 canon unicorns with red manes and such pale coats: Flim, Flam, and Sunset Shimmer.

Neither of these seem like good ways to get love, but at least Flim and Flam would be easy to kidnap and replace.

I image pretending to be one of the Brothers would be difficult for her, since neither of the brothers seem to be "in charge", so she would have to work alongside another changeling and treat it as an equal in public.

Also, SS doesn't even live in the same dimension as everypony else anymore.