AFAIK, clubs are obliged to let players go for NT competitions, and there even is a fixed date for when they have to let them go, I think it's 14 days before the start of the competition. The license of players "belongs" to the federation, so if Turkey summons Neriman to NT there is no way her club can not allow her to go. Well there is a way, they could threaten to cancel her contract, but it would be ethically waaaaay wrong.
The same thing happened in the men's side. Lucarelli was not allowed by his club to play for the NT back in 2018. Which was a blessing in disguise because Douglas got to shine and snatched the Best OH award.