Lost kitten - How to attract it?

So, I recently(about a month ago) I started feeding a stray cat, which seemed to be sick and is sick.(Couching,breathing loudly) Anyways, about two weeks earlier the cat brought a kitten to my place(about 7 weeks, may be younger) and I had been feeding it too. But four days ago, when the weather was medium rainny, the kitten did not appear to my garden and haven't showed up till today. From the time the kitten came, it always stayed in my garden, sleeping, eating, etc, left very few times. The cat still comes although the kitten is nowhere to be found.  What could have happened to it? It was definitely not picked up by someone as even I was unable to catch it and it was definitely not attacked by other animals(apart from cats), as there are not any in my area.

So,  I've read that puting tuna out may attract it, is there anything else I can do to attract the female kitten?

I would have to say tuna as well.

The tuna water/juice smell really carries far, so pouring some around should help bring it out.

Do you plan to trap the sick momma cat?

She needs vetting, poor thing.