Situation is we are going out for dinner and she will have to look for baby from 3-4 pm to 9 pm. We have offered her to pay 25 CHF per hour but we do not know if we also have to give extra tips or offer her something to eat. We always have some snacks and coffee/tea at home but for sure if we have to offer dinner then we have to arrange.
You arranged the time and agreed it, yes? So if sitter wants dinner she will probably bring something or get it later. We normally point at the kitchen and say help yourself
25.- per hour is already at the top end of the pay scale, we pay much less, not because we shopped around for a cheap person but just because both ladies who baby sit for us charge less, one is 15.- and one is 20.-
But in our case the kids need feeding too so they can all eat together.
Not sure if what we do is expected practice but then telling someone to help themselves in the kitchen probably means that the baby sitter will feel a bit uneasy about what and how much they can eat.
Baby sitters are basically someone else's kid. You'd like to think that if it was your kid, someone would sort out something for them to eat.
But yes if i was specially asking the baby sitter to cover dinner and feed my kids I would include it in the conversation - does she want to eat with them or will she sort herself out - they are having xyz food etc.
I think you should be able to have a very open conversation with someone who is coming into your home to look after your baby or children.
I used to ask what snacks the babysitter liked, and I would supply those.
If it was a long period of time which involved a meal, then it really depends on if they are minding just a baby (who is not eating solid foods) or children and they might all eat together. Often it is easier to prepare something in advance, which your children like to eat, and check if the babysitter likes it too.
Be sure to ask if your babysitter has any food allergies or sensitivities. If you have a child with allergies, be clear if you do not want the babysitter bringing food into the house.
If the babysitter does not drive, then you should find out how she is planning to get home.
No doubt she does a good job as appreciative of the generous income & also for her not much traveling and in your original post you are home at a very decent hour, not that it should matter if on another occasion later if she is aware.
One of the toughest parts of living as an expat is not having family on hand to babysit. So if you do find someone whom you can trust, that is worth paying a bit more for.
You could ask her whether there is any aspect of the arrangement she would like changed, and voice anything you've noticed that you'd like done differently, e.g. did she deal with the dishes, are the children all jittery or are they fast asleep when you get home, have her snow-salty shoes marked the hallway, etc.
My advice is: get it right with her from the start, and check with her again every few months, so that such less-than-perfect matters don't even get the chance to build up as resentment between you. That way, you may well find you have a trustworthy babysitter, with comfortable communication, for years!