Is there any chance she was just recently spayed? Maybe her hormones have not calmed down enough yet. Mounting on top is a show of dominance. Cats do it also just for play. When they do it for play no teeth will be involved.
Watch their reactions closely.
Introductions can take time. It just depends on the cats. Some get along great right from the start, but others can take very long to decided to tolerate each other. Keep the introductions slow. If you rush and things go badly it just sets things back a bit. Then you have to start fresh.
I always like to use a yummy food reward when doing introductions. I like to use plain cooked chicken or bits of canned tuna. You want it to be extra special so they associate each other with this yummy treat.
Watch their reactions closely.
Introductions can take time. It just depends on the cats. Some get along great right from the start, but others can take very long to decided to tolerate each other. Keep the introductions slow. If you rush and things go badly it just sets things back a bit. Then you have to start fresh.
I always like to use a yummy food reward when doing introductions. I like to use plain cooked chicken or bits of canned tuna. You want it to be extra special so they associate each other with this yummy treat.