I think an undercoat like this works best:

https://www.amazon.com/ORDERMORE-Undercoat-Anti-Slip-Handle-Grooming/dp/B073ZK287B/ref=mp_s_a_1_15?keywords=undercoat+rake&qid=1646833847&sr=8-15

I also like to use a wire pin brush like this:

https://www.amazon.com/Bass-Brushes-BASS-Wire-Groomer/dp/B00KSL0CZO/ref=mp_s_a_1_4?crid=HKHSE8FSJYVU&keywords=bass+wire+pin+dog+brush&qid=1646834117&sprefix=bass+wire+pin+dog+brush%2Caps%2C153&sr=8-4

If she is spayed, then yes they tend to only blow the coat on the backside.