OK, so first time poster, long timer lurker, yadda yadda...
So yeah, previous discussions/knowledge not withstanding, Dora is probably realizing just how hard Marten has fallen for Padma, and senses the potential of much turmoil on the horizon. She would, after all, be one of the best at reading his non-verbals and tone. Dora could be remembering mopey Marten from their breakup, or even further back to Marten's original cross country shenanigans and why he moved East in the first place.
So if she is, does she step in and try to "save" him as a friend? Does she organize the CoD crew for wacky hijinx in order to intervene? Does she sit back and wait to be the friend/shoulder to mope on when Padma does leave? Etc., Etc..
Lots of different ways it could go, if Dora gets more involved in the ongoing plot. Or not, if it's just a one-off.