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She may have cold tail. She may also have injured her tail, so you will want to check her tail over well. She could also have a problem with her anal glands which will cause a dog to hold their tail down or to one side as well. The anal glands are 2 sacs on either side of the anus at about the 4' o'clock and 8 o'clock positions. If your dog is continually licking their anus and dragging it, it could also indicate that they are full. This problem can usually be resolved by emptying out the glands. To empty them or express them, you will want to cover the area with a tissue and press your finger on the dog's anal glands with an upward motion. A foul smelling liquid should come out. If nothing comes out and your dog appears to be in pain, you should take him to the Vet. Your vet can do this easily, as he is experienced at it. Excellent site on anal glands
It doesn't sound like an anal gland problem, but better to have the information than not. There is a condition "cold tail" that Labradors, English Pointers, English Setters, Foxhounds and Beagles sometimes get which causes them to hold their tail close to the body or to one side or the other. You can read about it here.
Cold tail often happens after a bath, swimming or any activity where the tail gets wet, so this can not be ruled out. It is possible that this is what you are seeing with your dog. With cold tail it sometimes takes up to 2 weeks for the tail to recover. Some owners feel the administration of anti-inflammatory medication aid in a faster recovery.
Dog's have sebaceous glands and perianal glands at the base of their tails. Sometimes, these glands can become clogged and swollen. A warm compress on the spot and cleaning with Benzyl peroxide gel may help with the problem. I would also use some Neosporin or triple antibiotic cream on the area as well. Dogs with this swelling of the sebaceous gland may have a problem with hypothyroidism or a hormonal imbalance, so I would suggest you have your dog seen by your vet if you do not see improvement.
I hope this information is helpful to you. I am sorry that a definite cause can't be determined, but these should give you an idea. If you would like any additional information or have more questions please don’t hesitate to press the reply to expert or continue conversation button so I can address any issues you still have . If you do find this helpful, please take this opportunity to rate my answer.