The movie I’m looking for and have been for years is an older French movie could be from the 70’s maybe earlier. A “normal ” housewife finds out that her husband is cheating on her but isn’t really sure what to do about it nor does she care too much. She has a rich neighbor (white lady) who is fairly young and very eccentric who helps her “normal” neighbor by taking her under her wing a bit. This is where the movie gets really grippy and they go down this big water slide in the eccentric neighbors house and sort of end up in another dimension? All these weird triply things start to happen but it’s a really good movie . Would appreciate any input thankyou so much !