Hey I have this problem going on know too. Mr Foggy has harrased them all. Even my husband and I to death. But please keep in mind that most cats are very very smart. We have adopted a spray bottle full of water. And everytime we see him harrasing we give him a straight squirt and and a loud voice that says NO. So know we are at the stage of two things, one -wesay no and he runs, or two be pick up the spray bottle and shake it and he hears it and runs. So we are making much needed progress. Please consider this method, it has worked for many of us. Right know your new freind is still young, and it is completely normal for them to want to play, which we call harrasing. She will grow out of it. Get her fixed and give her time, and a few no's and squirts.

Good luck