#also decepticons were devastated when they realized their leader had been captured...

[krockdove]

earthspark official guidebook says the final battle took place 15 years ago (the Battle of the Bay, right?) and that Dorothy and Megatron first met. She was helping wounded Decepticons and Megatron was impressed with her. Then it says in the same battle, Dorothy lost her leg and Megatron took her to Optimus for treatment. Does that mean.......

Megatron was captured himself to save Dorothy????

That's why that battle was the "final" battle, because the decepticon leader was taken prisoner so war was oficially over?????

(the Space Bridge Battle was definitly after that.......omg...)

.....if so, it makes sense Dot doesn't like Optimus that much, she wouldn't be happy about he taking advantage of the favor Megatron gave her in such a way – even though he had to do.

She was likely unconscious when she was injured, Megatron had no choice because he didn't know how to help human.

and Optimus probably didn't tell her Megatron saved her life while she was recovering. He had to suspect Megatron's true intentions and couldn't let her get caught up in it, but I can also see Dorothy was very upset when she found out.

It would have taken no time at all for her to get to Megatron's cell in her wheelchair while he was trying to come up with a rational explanation for why he saved a human soldier and was captured.