I don't think it's a necessary change tho. She can only stun a single enemy only after 3 sec anyway. Diggie's 1st skill, Nana's 2nd skill and Rafaela's ulti has stun too.
Well... she has spamming heal skill... and teleport... aside from that... 2nd skill slows the target til it stuns... no escape already unless flicker or have escape skill...