Windows to termites, what up with this?

Windows aren’t usually an issue for termites.  Termites can show up in some strange places, this is a bathroom window. Obviously they are coming down above the window or maybe they just wanted a better view. But we know we definitely know we have termites. So now what to do and where are they coming from, floating slab – probably, we did check outside but no evidence. Showers can be extremely tricky especially drilling close to pipes and ceramic floors.