Nikki was badly injured after she saved everyone from the krang as Donnie usher to Nikki first

Donnie: nikki are you okay?!

Nikki collapsed

Ralph,Mikey,Leo,splinter,Draxum, April: nikki!!!!!

Leo: Donnie we need to get Nikki back to our base to med bay now!

Donnienods as he gently picks up Nikki and rushed back to the base

Draxum: Jesus her arm was cut off and she’s only 5 too

As they took Nikki in base in to med bay