I think the answer would be to tell her friends how much she likes being on the team because then they can know that it's something she likes to do and hopefully they'll respect that and not make fun of her.
A conflict arising between any two persons like in between siblings can be referred as relationship conflict, man versus man or external conflict.
Explanation:
The conflicts between siblings are usually due to
- Competence, achievements or over-performances of one over another
- Receiving unequal amount of attention from parents and others
- Personal, physical, or psychological issues
Conflicts arising due to achievement differences often lead to inferiority complex in the less achieved person and superiority complex in the high achieved person.
False it is not normal yet some people may still do it
A disease? there are no answer choices