
Hi,
Things are certainly pointing towards some form of hormonal upheaval. Many pregnant bitches seem to excite dogs in this way, so as you know for sure that she has not been mated then the likelihood is that she is brewing a phantom. There is also the possibility of infection, so I would get the vet to take her temperature and generally check her out. Speaking personally, if my bitch was brewing a phantom I would not have her spayed till it had settled down - about 15 or 16 weeks after the start of her season. But if it is an infection making her act like this then spaying sooner rather than later is the way to go. The raspberry leaf tablets will do her no harm, and will ease the symptoms of a phantom. But I would certainly get the vet to check her out. Hope all is well - good luck.
:)