I bought her 2weeks ago and from two days she is acting strange she is sitting down trying to hide not swimming alot only hiding
So is she pregnant and when so will drop the fry
The guppy does look pregnant and so if she gives birth in your main tank, your fish will probably try to eat the little guppies but if you give the guppies little decorations for them to hide in, they should be safe.
Can we get the dimensions of the tank? From the pic, it looks massively overstocked and I wouldn't be surprised if your ammonia levels were soaring. The fancy (?) goldfish are not compatible size-wise and temperature-wise. They need 20 gallons for one and +10 for each additional. I would return them, or rehome them.
Don't put her in a breeder box, it will only stress her out more. Don't try to save the fry either, because you're overstocked as it is.