Maybe something similar will happen like how when Obito was controlling the Juubi, Ino could only control Obito for 2 seconds.How would it work when katsuyu is mentally connected to summoner.Inner sakura in part was able to remove ino's possesion so don't see reason why the summoner can't
Still why would Sakura even summon Katsuyu. That's dumb when that just allows Temari to summon Kamatari which is far faster than Katsuyu. Inb4 Super Yang or Femme.