@tsarstepan,
She's not big on food. Eats a couple of mouthfuls an hour or so. Sometimes.
one has to use the direct approach.
Grab cat, caress and stroke her to relax her, hold the cat down, open her mouth, and pop the pill in, hold mouth closed, stroke cat and throat until she swallows.
Sometimes she PRETENDS to swallow.
In which case, it's repeat as needed.
She then stalks off, muttering threats and imprecations under her breath, and glares at me for a while.