Thank you for taking the time to reply to my questions.
It is unlikely that what you are describing will have been caused by a hairball.
Considering the number of issues that your kitty seems to have going on, I think it would best for her if you get her seen at the ER.
The labored breathing, lack of eating, the lack of bowel movements, and possibly the pale gums (depending on how pale they are) are all concerning signs.
Systemic infections, bowel blockage, pneumonia, congestive heart failure, tumors, something stuck in the windpipe .... there are many possible causes for what could be going on, most all of them emergencies.
You can locate an ER vet in your area by using this site
Please keep me updated with the status of your kitty, and I hope you get her to feeling better soon.
If you have any follow-up questions, I would be happy to continue working with you if you would just hit "reply".
Otherwise good luck!