Healthy for me and my little Mojo

I have recently adopted a kitten from a friend who's fur baby had a litter. I have always been allergic to cats, but only those wearing flea collars. At Uni I temporarily cared for a stray who I named Clive, before we chip checked and then adopted him out as my housemate had a rabbit. I wasn't in the slightest sensitive to him. Nor was I sensitive to Nina, my mum's landlord's cat, UNTIL she started wearing a flea collar. So I adopted Mojo as my own present to myself for my 24th Birthday. 

Until now I've had no allergies to her, I rub my face on her in response to her face rubbing and I comb her as well, which, if I was allergic to cats themselves would surely get some reaction.

I've never had a cat to call me her pet so I was overjoyed when I got her. We got her Jabs last weekend, the  vet checked her over, perfect size weight for her 11 weeks and she has been a Joy. The vet gave me a frontline treatment for kittens and advised that though she had no sign of fleas to use it anyway. I have and it seems I'm allergic to this too.

The active ingredients are: Fipronil and Methoprene, this is all that is on the packet. I have no idea what the active ingredient is in Nina's collar but Mum will check for me tomorrow.

can anyone tell me:

are these the same as in flea collars?

Is it safe to only treat her if she shows signs of fleas?

I know kittens can quickly be over come by fleas at what age does this danger lessen?

I've used a spray in the house before can this be effective on its own as I showed no signs of allergy with this.

Mojo is and will forever be an indoor only cat BUT we have cat visitors on the mat as there are many large cats in our area.

thanks in advance for replies. I just want the best for her, but I don't want to risk my health.

There are many ways to deal with fleas. You shouldn't have to use products that cause an allergic reaction. There are some flea products that are in pill form, so they wouldn't be on the cat's skin. Maybe that type would work better for you?

I don't know what spray you used; some are more effective than others, but spraying the house can be an effective way to kill fleas, yes. And it is perfectly fine to use flea killing products only when there are signs of fleas. That's what I do, because I don't like to use pesticides unless absolutely necessary.

I'm a bit unsure of what you mean when you say you have visitors "on the mat"?

IMO, with one indoor cat, if you are diligent checking for a potential problem there is ZERO reason

to use any potential toxic products. Toxic for your kitty AND toxic for you!

You are NOT going to wake up one morning with a huge flea problem out of the blue...

Do keep checking periodically with a flea comb for live fleas and flea dirt.

"Flee dirt" is basically flea poop.  If you find rust or brown colored specks in the comb, put them on a paper towel,

wet it with water, wait a few minutes and if the stains spread out rusty red on your paper towel, it is quite likely flea dirt.

IMO, don't blow up an ant hill with a nuclear bomb   Just stay informed.

Sounds like you really love your new little friend... Hope you have a very nice and loving life together. Cats are truly special!!