I didn't watch the whole thing - skipped around a bitLOL
She's o.k. I suppose, but I have a hard time watching a complete video of hers.
Anyway - I agree with with what
@21hens-incharge mentioned.
A complete poultry feed should be given as the main source of nutrition to coop/run kept birds.
Oyster shells, that's a given.
Animal protein. Now I am a fan of giving a higher protein than 16% layer feed, but many people have no problems whatsoever. I do use an all flock type feed, but I have roosters, plus a few hens that don't really lay much anymore. You can easily give extra protein a few times a week by giving a small eggs, meat, fish - salt content is a good point so keep that in mind when giving canned fish.
The main thing would be giving a nutritionally balanced poultry feed and making that available during waking hours.
I really don't think you can "make" hens lay more eggs. Each hen is an individual, so she has her own laying cycle.
Something else to think about - being heavy handed with "treats" no matter what is it - from corn to mealworms to meat - could make hens "fat" - this would likely reduce production over time and cause health problems like Fatty Liver Disease.
I agree, some is trial and error.