Her colours make me think black sallander? potentially broken based on her sister and how her marking end quite abruptly. I'm not experienced with that colour to be really sure.
If that is it, she would be <aaB_chd_D_eeEnen> (or enen for solid)
The sister is a broken tort, <aaB_C_D_eeEnen>, it is essentially the same without the chinchilla gene, so it adds up.