I would suggest a health check up for her as this could be due to a problem called spay incontinence or an issue with her kidneys or urinary tract.
Its probably not jealousy but more likely is sphincter valve control or not feeling well.
As she is overweight and tires easily you may want to have her checked for a thyroid problem.
An imbalance in the thyroid or the adrenal glands can lead to problems such as you describe.
In the meantime while you work on figuring out the health issues to keep your floors clean you could put some britches on her with an incontinence pad in them or use diapers with a tail hole cut in them for while she is in the house. That way if she leaks you only have to discard a pad or diaper not wash everything.
You can see britches here
http://www.brownkennelsupply.com/petp05.htm
Hope this helps you!
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