If she behaves with her toys like they are her babies, take these away. Other than that you just wait. If her appetite is good and there is no vaginal discharge, if she otherwise behaves normally (some females do tend to be more aggressive with other dogs in that period), everything should be fine.
I just wanted to point out that you should spay her before her next heat. Females who get pseudopregnancies are at a higher risk of pyometra. A colleague of mine just managed to save his dog in the last possible moment, she had an emergency spay and a long recovery. They didn't spay her after her last heat, although they planned to because she got into pseudopregnancy, so 6 months later she got into heat again and after that she developed pyometra.