She needs to get them fixed, altered. You don't need more. My friend has a cat perch (I call it). It's high. She has a round platter like thing that has a ball or something and she throws catnip in it. If you put them in a kennel/cage, they will have a tendency to get very upset and spray. Doesn't matter it it's male or female. Since there are two, they basically are just playing and chasing each other. BUT PLEASE GET THEM ALTERED! if they aren't already. You can also keep a water bottle nearby and spray them where you don't want them. I had a cat and kept a spray bottle on the dining room table and kitchen counters that were identical. When my cat saw that she knew not to get up there. I sprayed her with both bottles. If she saw a bottle in a room that resembled those she would actually leave the room or hiss at them when she walked by.