Dealing with stress

I have come across a similar post on this group but I am seeking advice in my situation. I and my partner got recently married after dating for about 5 years. The last year and a half are when we truly lived together. Currently, we are staying a few hours apart because of work locations. A constant theme during the time we lived together and that has continued to until this day is a constant existential crisis on her end. I did empathize with it at times such as getting a new job and acclimated to a new job. But just listening to her problems and trying to comfort her in any possible manner including intervention from friends has not made the situation any better. I have become the default cribbing board that she can dump her troubles all day every day.

This has taken a new toll recently because I have a lot on my plate and I had taken ill (possibly covid - scheduled to get tested). I have not found a bone of empathy from her end. When I brought it up she realized and was sorry about it. For a few hours after that, she made courtesy calls to ask how I was doing only to follow up with how tired and frustrated she is. All this together along with the fact that she wants to move in with me to help with her stress scares me even more. I do not want to be filled with negativity and lose motivation in my work. However, I do truly love her and care for her. I have even suggested therapy to her which she has resisted considering. Where do I go from here and is there anything I can do?

TLDR: Partner constantly complains about everything (Esp work) and empathizing with her is not helping