At least in the US, "toilet" only refers to the actual hardware, not the whole room, and you would say "go to the bathroom" even if there is no bath there. "She goes to the bathroom" and "He goes to the bathroom" should be accepted.
Edit: "WC" isn't accepted either but should be.
In Australia we say 'go to the toilet', mind you I thought kamar kecil was used not toilet. We do also say 'go to the bathroom' or 'go to the ladies' if being more formal.
I have also never heard an Indonesian person say 'toilet' , only WC or kamar kecil, but who knows.