At the very least it would have been nice if there was some explanation as to what happened to her and why the Romulans didn't care about monitoring their cloak.
Agreed. This made no sense. Every time the defiant use their cloak, It reminds me of this and I think "Why are the romulans cool with them having a cloak unsupervised again?.. oh yeah, no explanation."
It just seems weird that they wouldn't want to keep it supervised. With the cloak in starfleet's posession they could easily just dissect the thing and figure out new weaknesses in it, and how to exploit those weaknesses to gain an advantage on the romulans. I end up rationalizing it in my head as "The romulans gave them a shitty 20 year old out of date model of their cloak, so they dont care" but i don't even really buy that.