Cat allergies and Visitors

I have 3 cats.

My sister in law is terribly allergic to cats.

Normally when she would visit, I would spend 2 days cleaning. I'd vaccuum a couple of times, wash all the curtains in the house, lint brush and vaccuum all the furniture, and sweep and wash all floors plus other assorted cleaning. Once I finished all that and the air had settled, I'd also spray down everything I could with allergy reducing spray.

Basically by the time I finished doing all this I'd be really tired and sore.

Now she knows that she's really allergic to cats but she absolutely refuses to take allergy pills before she comes to our house because she says they make her feel spacey when she drinks wine. The thing is, no matter how much I clean, I'm not going to get everything and usually within 10 minutes she starts having a great deal of trouble.

At this point we offer allergy pills.

She refuses.

She continues to suffer.

Her husband then starts with the, "are you having trouble, do you want to leave?", which makes me feel really shitty.

It makes me feel like I should have cleaned harder and more thoroughly. It also makes me feel like they don't actually want to see us because why else would she not take any allergy pills knowing full well that within 10 minutes she'll be having a massive allergy attack.

I find myself getting so fucking resentful and it's awful. Everytime I hear, "you're having trouble, do you want to go?", I just want to shout out, "just fucking leave already!!!!!".

And now to make it worse, this new house has wall to wall carpeting so there's no way in hell I'm going to get this place clean enough no matter how much I try.

So why should I fuckin' bother when she'll refuse to take allergy pills anyway?

Christ I'm grumpy.

I haven't seen them in over 6 months and I actually really like them but I always feel so awful when they visit...like I'm a bad host because of her allergies or something.

I'm at the point now where I'm angry and they haven't even arrived yet!

Gaaaaah!!!!!!!