you don't really have to provide 涼用梘液 for her... especially if you and your husband don't use it.... you can buy something more economic if you really want to provide la. It seems no good to tell her to use less... as it's better for her to be cleaned than dirty ~
I provide 涼用梘液 to my maid as we share the same 涼用梘液... and to avoid she storing too many things in her room / bathroom la.