Head looks proper in second picture. She appears to have a very deep chest in the first picture. Ears are a little questionable. Neither picture shows off the dog for the best determination. How about a couple more shots of her standing up . Thanks for sharing.
She’s definitely a mix. Unfortunately, brindle is not just a Dutch Shepherd color, so you would just be guessing on what she has in her. Hope you’re enjoying her.
She looks very similar to my dog Asia who is a well documented half Mal and half Dutch KNPV lines dog. Your dog even has the same eye line marking at the corner and larger deep rib cage. Asia is older now, but around 52 pounds however her build is smaller but she eats very well. Her belly, inner legs, even her toes and muzzle are now all silver since she's older but before she had darker fur. She's just turning gray gracefully.
This is Asia which looks very similiar to Mabel. Asia just turned 9 years old this past summer.