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Yes. The best way to tell on a molly is if she gets fat. If you have a specific fish in mind, I suggest you get a picture of her and start a thread about it. That way you can get a few opinions.
Yo those bamboo plant setups are not good. They have mites and a lot of those household plants are toxic to fish. A fertilizer used to treat that bamboo can and will affect fish that are introduced to it for the first time.
You don't have to take it out. It will be fine in there. If you want it, feel free to keep it. I have some I am trying to grow tall enough to stick out of my tanks.