To not want my friends nanny on holiday with us?

Yeah, that would alter the dynamics for both the adults and kids. I don't think I would go. When my DC were younger I often found that people with a nanny just didn't get that nobody else had a relationship with her nor did they want one really. The nanny plays such a pivotal role for them, they sometimes forget this.

I think perhaps the issue is how your friend views her nanny and it seems exploitative and you don’t want a part of that

Why shouldn't she bring her nanny for a more relaxing trip? Yabu really

Well they're not your nanny. The family who employ her have the right to bring her on holiday whenever they need her. Assuming she agrees.

I'd happily sleep on a blow up bed if it meant I was on holiday in Spain. Even if I was also working. So that to me isn't weird. As long as there is Aircon in the room.

I take it you wouldn't give up your bed for her?

Honestly I don't think you can really say anything against it. Especially as you say you don't even know her but everyone else thinks she is lovely.

It would bother me. I was on the fence a bit until I read the nanny would be on a blow in an office room. She shouldn’t be cooking either, except for for the children if she’s a nanny, but of course she’s an underpaid domestic labourer and I’d totally judge my friend for that. I don’t have a problem with people choosing to have a nanny, or employ domestic help, but just because you live somewhere that exploits migrant workers that doesn’t mean you have to. Your friend could employ a nanny and treat them as a U.K. nanny would expect to be treated but she doesn’t. If her family can’t afford to give the nanny decent accommodation, a fair wage and benefits and reasonable hours and time off then they should just look after their own bloody kids or tie a knot in it.

I wouldn’t enjoy my iced lattes by the pool in that scenario.

You can’t stop her coming if your friend is determined. I would be definitely making sure that the poor nanny was NOT looking after my kids as extra work. And doing what I could to make sure she was comfortable and respected.
Your friend doesn’t actually sound like a very nice person. She sees her nanny as a second class person. Would she be ok on a blowup bed and her work load suddenly being tripled?

You don't have to let the nanny look after your kids, but you can't dictate what she does with hers.

Well I don’t think you get to say “no” to the nanny coming. You could mention lightheartedly that the kids will be so busy playing the nanny won’t be needed. Or you can choose not to go.