Sorry that they aren't getting along.

When I had Rose (Husky/GSxBC, 2007-2015, RIP), and Pyg (Lab/PitvullxGS, 2007-2023, RIP), they were same age, 6 months apart and almost the same height/weight. Rose was Alpha.
When I would butcher chickens i would divide extras in two, and throw even pieces to both dogs, and they especially loved the chicken heads. At that time they were very close. When I let them both out for last call at the end of the day, they would take off running around the 4 care garage, do their business and come back in.
They Were fast friends.
One time Pyg was a little slow on the uptake and Rose bit her in the face

and stole her treat.
Rose left puncture wounds in Pyg's face, which fortunately, completely healed.
Their relationship was NEVER the same.
When Rose developed a disease that atrophied her jaws, and I had to have her euthanized, my Vet wanted Pyg to see her and know what had happened (which was in the kitchen.)
Pyg couldn't care Less, and she wanted to know what else was on the agenda that day.
When Pyg was euthanized, Eva was upset, but she was Most upset when we retired Pyg's collar, and it took some time for her to get over it. Eva was very attached to Pyg and was Beta.
I am waiting to hear form the breeder about his 2yo female GS, and a new litter, which will be related to Eva.
I expect and will encourage Eva to be Alpha and teach "Sasha" the ropes.