If you know her favorite litter location, I might have some tricks.
Scoop ALL litter first thing in the morning, and before each meal/mini-meal if you can. I work at home, so it might seem easier for me but it's not really because I get sucked into my work as easily as people out of the house which is tough, LOL. BUT, some tricks -
Find her favorite littler box spot - dig it out a little, shallow depression - get some cling-wrap plastic and put it over, tuck it in as best you can. Not big, just enough - maybe 3x3 or 4x4" etc...? And watch, and wait. Keep the ketone bottle or foil pack nearby and when you see her going to the box, get ready!!
On Fena's bad days, I watch from about 4-5 feet away, ready - but I let her do her thing but I step in BEFORE she wants to "cover it" - praise her, tell her what a good girl she is, pet her, but shoo her away carefully then you can test.
My Fena suffers a bit, brain wise, when it comes to the litter box - she'll dig a hole not to pee or poo in, but to "stand" in - and she'll try and cover her stuff by scratching at the bare hardwood floor, not realizing there's no litter there so sometimes it doesn't work out - sometimes she'll mess up the plastic, etc.
But it might give you a fair shot.
I used a spoon at first, but in the end it startled Fena too bad and she'd actually cry and move while peeing, which hurt her pride a lot - so in the event the plastic doesn't work, I just use my own hand. I ready a strip in my dominant hand and if she aims off the plastic, she knows my touch, so I just slip my own hand under her and she doesn't mind. It might seem gross and I guess in a way it is, but I don't wanna hear those cries anymore and it works out. That only happened 5 times though, with my hand. So far so good.
No ketones at all, thank god for that.
PS EDIT - after a good long nap your baby wakes up, chances are they'll go for the littler box to watch then especially - after naps.