Dip dye it in a warm water bath with red food coloring. Might be cheaper yet to buy an already pink fake flower. Also you'll know the exact shade by buying...I'm thinking a dollar store.
I want to dye a white fake carnation flower pink. Do you have any tips on how to dye a fake flower?
There is special color spray for just that purpose. This one is Colortool Floral Spray, and you can get it at most craft stores.
Spray paint yin
This should help. Method 3 and 4 might be just what you are looking for....