A handy step-by-step guide - Shoes "Sport" vor Adult

I have emailed you twice requesting assistance with this pattern. When can I expect a reply? I really like
the shoes and want to make them.
Thank you,
Doris Mansfield

The shoes sizes listed in the pattern say US sizes but the sizes seem to be smaller than US sizes.
I cannot find the Red Heart Cotton Blend yarn you used. Is there another substitute that will work?
I have used two other 4 ply yarns so far with no luck for the length of the sole to match the shoe size.
When you say the size is for US 9/10 how many inches is the sole supposed to be? I have gone up to
the largest size and the slippers are still not long enough for US women's size 9.
I would appreciate any help or advice.
Thank you,
Doris Mansfield