Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
What a frustrating issue! I do think you are correct to suspect she has a bowel problem that is contributing to her having loose or sticky stools. IF she has longer hair as well, then this makes it easier for a looser stool to get trapped in her hair.
The deworming was an excellent first step, but it is unusual for an adult cat to contract parasites that cause bowel problems. Instead, I worry that she may have another issue such as inflammatory bowel disease, organ issue (such as liver issue or pancreatitis) or an atypical infection in her digestive tract. The best recommendation for her is to have your veterinarian do an examination followed by some testing (cbc and chemistry profile with urine and electrolyte check, stool check). If everything is normal then an xray is indicated to ensure she did not swallow something that is trapped in her system and unable to pass through (I have seen more ingestion of hair bands in the past year than I can remember...silly cats).
In the meantime, you can always do a trial with administering bismuth subsalicylate solution which you may purchase at any pharmacy for people. Give no more than 0.5 ml (1/2 cc, 1cc = 1 ml) every 12 hours. This can only help and cannot hurt.
As well, having your veterinarian shave the hair around her anus can aid in not having stool get trapped in this area. If you have clippers you use for her at home, then you can do this yourself, but please do not get hurt if she does not like this.
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