I’m not sure how large Muir island is, but Betsy has scanned the entire island before. In comparison, Marvel Girl used her telepathy to try to contact Beast, who is 3,000 miles away from her. She succeeds briefly, but then loses him on Beasts end.
As far as fighting other psychics, a I can’t remember any notable ones except Sinister. A battle she lost, one that Jean won with no telepathy or minimum level telepathy. (A little unclear in Inferno) Going off of Marvel Girl, she has fought Mesmero in a stalemate.
Let’s also not forget that Marvel Girl has acted as a funnel for Xavier when he transferred the personalities of the worlds minds into one being through her into Alex to supercharge it and then Scott to direct it to fight off the Z’Nox.
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