Question, are you using low quality sprites?
I tried testing it with them but it didn't work on my computer, but it may cause her to be resized to twice the size she's supposed to be, but on high quality sprites, she's smaller than the normal engineer.
Good, I believe that's the intended size, at least that's what she looks like in my game haha. I think she's the same height as the engineer, but since she's more thin she looks smaller.