I'll tell you what I did. It might not be right, but it's what worked for me and the kittens. Is she lapping at all? The first thing I did was teach the kittens to lap. I put their supplement in a condiment dish (of all things, but it was a perfect size) and got them used to lapping. To wean them, I first used wet solid food. I found a very good brand of canned kitten food. I added some into their supplement (I used KMR). Once they got the hang of it (When they actually the majority into their mouths), I gradually introduced more solid food until they were eating solid food. Now, I'm in canned food stage, which is a good second step. When their teeth look good and strong, I started introducing a good quality kibble, just a few kibbles at a time to see what they do. They are now on a combination canned food/kibble and I'm gradually increasing the amount of kibble. This method was great for about half of the kittens I weaned (weaned 6 kittens total). The other three never learned to lap and went straight from the bottle to the solid food, after some coaxing with fingers laced with solid food. I personally liked the gradual method better, but these three kittens went from absolutely loving the bottle to hating KMR and not wanting to eat, so I had to resort to drastic measures to keep them healthy. Needless to say, they are now all rather large for their age.
I don't know, there's been a lot of talk lately about what diet is best for cats. Before, it was table scraps, milk, and fish. Then canned food came on the scene, followed by dry kibble being all the rage. Now vets can't make up their minds. Some say canned, some say dry, some say combination. I'm teaching the kittens I'm going to adopt out to be flexible and eat both. Who knows what the owner's going to decide.
My kittens are about a week older than yours, right at 6 weeks. I have five from one litter raised from 1 week and an older kitten that I raised first from three weeks. I hope this helps a little and I wish you the best of luck. It's hard raising a young kitten and raising 6 has been no picnic.
llj