Paula - I would have said your lovely filly is a perlino due to the darker tail. In my experience cremello's have white white manes and tails.
Reviewing posts and was going to post to the OP, but then realized I'd posted.
i do wear glasses and maybe I don't see the darker shade in her mane and tail that others see. The one problem with that theory Ruffian, (
) is that when her tail is washed (not with bluing which I've never actually used, but with either Dawn, a fungicide shampoo for rain rot or Mane & Tail), it's very white. That "yellow" in her tail is exactly that - yellow with urine. She wets her tail almost every time she goes when it's below her hocks. Smells pretty "good" too, NOT. My male barn cats (recently all 3 were neutered) - love playing with her tail - more so than any other horse or pony we have. I don't pick them up after they've been "in her tail", LOL. I don't wash her tail regularly - which is why I don't just grab and brush it on a regular basis when we groom her. I do warn others that are around that help with grooming or want to pet on her when she's tied or being handled.
Maybe i'm too influenced by all the non-color appreciating neighbors and friends that we have - to all of them - she's just "the white one"...
and to lump it all together all my silver dapples w/ their many beautiful shades are all referred to as "the tan ones" and the gorgeous bays - also of different shades - some solid, some pinto - are "the brown ones".
I worried forever when someone once referred to one of our bay Arab mares as "black" - could not figure out who they were talking about - as I had only one true black pinto pony stallion at that time. Of course, one year that mare "faded out" so much that she appeared to be a "true" dun or sooty buckskin! In the arab world, she is sometimes referred to as a black bay - I've just always called her a dark bay.
I love playing with color and the different things that happen... We'd never even considered that she might be a perlino - until the test came back with one bay gene. Now I have a question - maybe she is a cremello. I now understand that agouti doesn't work on red and that chestnuts can carry agouti and pass it on - but it won't show on the chestnut. SOOOO her test came back as - eeAaCrCr. I'm thinking that that makes her a cremello (carrying the bay gene she can pass on - but not displaying it) not a perlino since she has no black for it to be displayed on...
Me thinks I need to update her page again, LOL!!