Who wins between these two? (Young Jean)

Considering both of their training and abilities, Teen Jean would almost certainly win any straight fight between the two, unless Kamala could somehow shield her own thoughts from Jean, and then ambush her and take her down with a single punch, in all likelyhood though Jean could beat her in any number of ways including shut down her brain, alter her memories alter her perceptions of reality, overpower her with Telekinesis or Jean could trap Kamala's mind inside her own imagined reality, forcing her to live in in her own fanfiction...

Jean, obviously

Jean in stomp. As far as I know, Kamala has not demonstrated any resistance to psychic assault. Am I wrong?

Ms marvel is a joke

Jean, her psychic ability is immensely powerful.

Complete mismatch