She may be pure lionhead.
She looks very similar to Biscuit, and she is pure lionhead (as much as they ever are, having been bred to look like that).
There are two types of lionheads the single mane and the double maned. She may be a single.
Also you will find the mane disappears a lot seasonally. Biscuit's has just exploded and she has a right furry face at the moment!