The Protector sentinels not useable in it’s current iteration and that’s primary reason why she is weak currently. Before it was reliable and you could use it to cut down on the opponents units.
Now it doesn’t feel like it works half the time or it targets different units then you selected meaning you can’t remove key units during an engagement.
If you intend to keep it this way either scrap the ability entirely and replace it with some thing more beneficial or you’ll have to make the Protector sentinels stronger themselves instead.