"Elle se junta con su amigas cada Sábado" was not accepted. I assume that's because I used juntarse, not because I falsely capitalised sábado. Doesn't juntarse literally mean "get together" and should be accepted?
No direct object pronoun (los) needed.
TodOs lOs sábadOs all must be masculine plural.
After "con," no "personal a" should be used. "Amigas" is the object of the preposition "con," not a direct object.
"Sus" needs to be plural to agree with "amigas."