The internal sutures can take weeks or months to dissolve, so that probably IS what you felt. My jamie was spayed a few months back and you can still feel the end of it through her skin, same with my in-laws' dog (both were spayed on the same day).
On a separate issue: that incision does NOT look right... it has either not healed properly, is infected, or she has been licking at it and that infected it. Regardless, you should bring it to the attention of your vet and have it looked at and maybe get some antibiotics. An abdominal incision infection is NOTHING to take lightly, so please bring 'er back in for a checkup soon
It could also very well be that she is reacting to the sutures they used; it IS a "foreign body", after all, and her body may recognize it and think "UH OH, not supposed to be there, get it out!" and cause the irritation, which can cause to itching/licking/scratching, etc.
So, in my opinion, the thread poking at the skin was irritating to your dog and maybe she was licking/biting/scratching at the area, which may have caused the "blood blister" AND the incision to become red/irritated (and angry, as my instructor would say lol) and possibly infected -OR- she is having a reaction to the type of suture used.
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