Where is Elizabeth! LOL!
She always has good suggestions for preK!
I have never seen an Oak Meadow K, but I had a used copy of the preK
I was VERY disappointed.
It was two books for the adult to read.
I really like lesson plans and cutesy craft ideas and songs and guidelines.
It was NOT for us.
Do you want letters and numbers and light academics?
Why not go with
www.fiveinarow.com?
or Peak With Books.
Both base lessons around a classic book.
A gentle learning approach that many children and parents seem to enjoy.
www.sonlight.com can be used for more than a year
It is a Chrisitan company, but can be adapted to secular.
There is a secular users yahoo email group.
For my first dd's 'preschool' we read, read, read. Songs, crafts, and she helped out a lot around the house.
We tried to keep a focus... one week, one letter.
We would always check out library books about subjects that started with that letter... an animal, a country, a story book, etc
She really loved that.
Basically what Five In a Row is, but I only had one child and I liked to plan so I did not need a book.
You could use this:
http://www.letteroftheweek.com/preschool_age_3.html
Ds is now 5. For his 'preschool', he liked to do math and lots of it.
He has really enjoyed the Singapore Math workbooks. We started with Earlybird.
He also liked the preK/K workbooks from Wal-Mart.
My third child is 3.
Right now, we are using PRE-K materials from
www.hwtears.com and lots of crafts and stories.
We have 'school' each morning while my oldest dd completes her 'on her own work'.
I think the best thing to do in early ages is establish a rhythm to your days.
Let them help around the house, sing songs, create, play in the dirt. Often schools mimic the home environment then homeschoolers try to mimic the school environment which is a model of the home environment...
We (speaking for myself here!

get really caught up in getting the 'right' books or 'right' curriculum. There is no one right curriculum. Winnie will benefit from having some one on one mom time.
I know, these were not waldorf or montessori suggestions!
But, I hope you can glean something from my comments anyway.
Hope