You have only had Marshmellow for 2 months so she still is settling in
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by not listening what do you mean? Are they not pay attention to you everywhere or specific places?
it will take time! Everything is still very new to her and she is learning, dog training takes time some dogs pick up on things quickly others need more time. I wouldnāt expect too much from her at the moment, give her more time to bond with you and settle in
are you doing training sessions with only one at a time? If not then thats one place to start
the other things you could try
-settling together
teach them to go to their beds, separately at first.Then do it with both dogs together (You can separate them with a gate at first)
-if you have a extra person you can try going on a walk with both dogs, the aim would be that they sniff and ignore each other
-play with the dogs when they are together and when they arenāt
-treats every time the pay attention to you when they are together
you might need to do these things with 1 dog at a time then try with both
I hope this helps!