You should consult your vet in order to make sure what you bought is both safe and effective. You will also likely need to give multiple doses, a few weeks apart, in order to kill all tapeworms at all life cycles. Does she also have fleas? if so, she needs vet-approved treatment for them too.
Please also make sure to keep your cat completely inside and away from any intact males until she can be spayed when the kittens are 8-weeks-old. She can get pregnant again within a week of delivery.
This is what I ordered online from Amazon, everything I looked up said that the Tradewinds tapeworm tablets were OK for Queens I have not given it to her yet and she is an indoor cat she does not go outside my male cat made it with her right before she got fixed he was fixed on January 13th she was in heat the whole week before
I work tomorrow n Tuesday n Wednesday I will b having surge n need to stay in the hospital overnight my work schedule only consists of 6 a.m. to 2 p.m. but Wednesday morning 8 a.m. I'll be at the hospital till sometime Thursday I'm so nervous she's going to have these kittens without me, she isnt one-year-old until April 1st, and this is her first and last litter. I just hope all her instincts kick in, in case I'm not available to be here
I understand your anxiety. She will more than likely be fine if she has them while you are gone. Some cats even delay labor until their person is there!