From Susan:
My mother is a flower freak and she is coming to visit me from Nebraska next weekend. I have taken her to Powell Gardens and she loved it, just a little bit too much walking. Do you have any suggestions on where I could take her that could live up to that but something new.

Here is some other suggestions:
Overland Park Arboretum - the Monet Garden is outstanding. It is close and easy walk, about 179th and Antioch.
John Wornall House, Herb Garden south of the Plaza.
Kaufman Gardens as Hortis indicated
Deanna Rose Farmstead, small demonstration garden
As for Loose Park, give it break this year. Starting this fall it will undergo a major renovation so the inputs have been low this summer. Most of the beds and roses will be removed for grading and replanting.
Enjoy - Dennis - Johnson County Extension