Unfortunately you really don't want to push it more then about 25C in the room at the very highest assuming it's only for an hour or two and the humidity is low (well below 50%) and the chin isn't playing. The chin will die if kept in temps that high for any real length of time. A fan will do nothing but blow hot air around and likely make your chin sick if it's blowing on her. Chins don't have sweat glands, they are from a cold dry climate so sweating would naturally be bad. Fans can be good to help circulate already cool air around, or to pull cool air into the room if it's colder outside to cool a room down (assuming the chin is not in the path of the air flow) but that's about it. A bowl of ice is not a good idea either, it might work as a very very temporary fix until you can get the chin into a cooler room, but chins should not get wet, their fur will get moldy and fall out if not completely dried off. Also a chin could drown in a bowl of water. Some people do use bottles of water wrapped in fleece to keep them dry, as a temporary fix, but those need to be changed out every hour or so and only work if the chin is willing to go near it. Stone tiles, frozen and changed out every half hour can also be used in addition to help, but really are for additional cooling in an already cool room and once again only if your chin is willing to sit on it. As ticklechin mentioned, if you have a basement or something that is cooler that can be another option, growing up we never had ac and kept the chins in the down stairs with the cages on brick and concrete, with heavy blinds to block any sunlight, the room never got too too hot. Not sure exactly sure on the actual temp but probably in the 20s C even when it was close to 40C outside on occasion. Oh and just so you know, no playing with or touching the chin if it's hot out. Having a thermometer near the cage that also measures humidity really helps to keep an eye on what the room is like.
An air conditioner is really the only way to keep the temp and humidity at the right levels for a chin (below 25C and below 50% humidity). If you can't afford one or have a room that the chin can go that isn't going to get much past lower 20s C I suggest you look into rehoming your chin with someone who can. Also, I don't know what it's like in France, but if an ac unit is out of your price range you might want to keep in mind that most places vet bills can easily reach the hundreds to thousands of dollars since chins are exotics and need to see an exotic specialist that knows chins.