OR since the Extreme Dilute gene was discovered in the New England and east coast states she could be Hetero ED(one gene of ED and one gene of DEW) which would be a Golden with the dilution gene, and the Dark Eared White gene. The fact you say she was an Off white color when young leads me to believe she is that.
Here is Maribel who at 1 year old this coming April 9th resides with Erin R.
Maribel has a 4 generation pedigree with not one gene of Silver gray, and is Homozygous ED. Maribel's sisters kept for breeding were Iris who is a Black Tort Band also residing with Erin R, and Gloria who was a Homo ED Black Tort Band.
Here's Maribel on 6-10-14
Maribel 6-10-14-b.JPG
and on 8-20-14
Maribel 8-20-14-b.jpg
Sadly I never got to breed her as she would absorb the litter every time. However her sisters produced Gloria(Dam to my A15 litter) and Hekomi's Pekoe(Dam to Hekomi's B14 litter)
Here is a photo of Maribel and her siblings at 3 weeks old with Marabel in the forefront, and her only other ED sister Glory above her with the cross patten on her back. Note eyes were open but I used a flash so most of the pups had their eyes shut while blinking
P1010004.jpg