I will shut my brain and accept this as a "this is how things happen in Oishinbo world". The same manga who polish their rice manually(I believe the famicom adaptation even said the chef do it one by one so they have even shape if I recall it right)
I mean 8 years but if you see her body that does not belong to 8 years old and infact she is actually older thanks from being reincarnated...she is legal right?
There are probably some deviation but I think it won't change much unless they want manga version to be quite different or lighter...or just skipping part of arc.