Thank you for your patience with my questions. Some dogs have pretty deep set anal glands, and some dogs have glands in slightly different areas than the 4 and 8 o'clock positions. She must have thought you'd really lost your mind when you tried to express them :). I think at this point you should consider trying a warm (not hot) compress for about 5 minutes twice a day. You can also pick up some canned pumpkin from the grocery store and see if you can get her to take some. This actually helps bulk up the stool a little, which can help express the anal glands naturally. Normally I would suggest mixing the pumpkin in with the food, but you may have to just give it to her if she is not wanting to eat. I wouldn't give more than one table spoon of the pumpkin twice a day. I know you have seen a you tube video on anal gland expression, but the following link is informative as well. Please understand, I don't think you should try to express the glands again, because it is possible to cause some damage if she does in fact have an abscess brewing back there. I think comfort wise it is better to try the compresses and pumpkin. Any, here is the link.
If she is not vomiting and is holding water down, maybe you could tempt her to eat something other than her food. I know that she might not feel all that great, and that she hasn't had a bowel movement and sometimes eating can help things move along, so to speak. I think you can try some canned chicken, which you can buy from the grocery store (same area as the tuna fish). You don't have to cook it or season it, but you can put it in the microwave for about 12-15 seconds to warm it up if you like. Just be careful you don't cook it too long, we don't want her to burn her mouth. If she doesn't want to eat, don't force it. If she is nauseated then making her eat can make things much worse.
Dogs can scoot because of intestinal parasites, and fleas do contain tapeworms, which infect the dog or cat after they ingest the flea. Please see the following website for more information.
The safest bet for tapeworm meds are those that come from the vet. I'm pretty leery of anything available over the counter, because in my experience they just don't work, and some are pretty unsafe.
It sounds like the benedryl was helpful for her, and you can continue to give it at a dose of 1mg/lb of body weight. You can do this every 8 hours if needed. Be sure not to overdose her, because it can cause some pretty scary symptoms (central nervous system stimulation).
And of course, it is a holiday weekend and Princess is exhibiting the fabulous timing that dogs are known for. While it does not sound like she is too uncomfortable now, it sounded like last night was pretty miserable for both of you. If she gets to that point again, or if she develops more symptoms, consider having her seen by an emergency vet so that she can get some relief and you can both get some sleep. Trust me, we love it when we get "emergency anal glands" or "emergency tapeworms" because it's usually something pretty straightforward and easy to fix, and we know we can make the pet feel better and give the owner's peace of mind. If she does well and can wait to see her regular vet when they open again next week great. You may want to go to the pet store today and pick up an e-collar to keep her from licking at her bottom, just to keep it from getting more raw and uncomfortable. You can also pick up some Boudreaux's Butt paste if the area is particularly raw, as this will soothe it. If you can't find any Boudreaux's, ask the pharmacist about something comparable, just steer clear of steroids added to ointments. Benedryl does have a topical ointment that may be soothing for her if you want to get some. Without an e-collar, whatever you put on her bottom will be licked off.
I hope Princess is back to her normal self very soon, and that she can put this embarrassing issue behind her (pun intended?). Let me know if I can be of further assistance. Have a great holiday, be safe.