Lola Litter/Solid Food? Help

So the kittens are 7 weeks old today, but I have a concern....

Three of the kittens have been using the litter tray and eating dry/wet food now for about 2 weeks, but I've only ever seen Lola use the litter tray ONCE!! And I don't think I have ever seen her eat solid food yet, or drink water. She will be going to her new home at 9 weeks (my neighbour) so I need to get this sorted.

I have 3 food bowls for the cats to share and 2 water bowls. She will be a long haired cat once she fully grows into her coat and has very long whiskers, so I have deliberately put out a large food bowl, incase the others are too small.

There is no poop around the house so she must be doing it somewhere and I haven't seen Ziggy licking her behind. She goes in the liiter tray but mostly seems to at it (The litter I've been using is 'okay' for her to eat ) When she eats it a pick her out and put her by the food, but she doesn't want to know.

She won't eat off of my finger, but will eat off of my dinner plate (while I'm trying to eat) Should I seperate her from the others and put a plate down for her to eat from? And how about the litter? What do I do about that? Any advise would be really helpful.

Usually, weaning age is eight weeks -- are you positive Lola is fully weaned? If you are, you might try isolating her in a separate location with her own litterbox and her own food and water long enough to find out what, when, and how she is eating and eliminating. That would be my best plan -- if you have a large kennel cage this would be ideal, because she'd be in the same room with her mom and sibs, and so would not be lonely...