Hi agrace, I agree that you don't want to necessarily putanything on your resume, besides stay -at -home mom. But in a cover letter, it is extremely important to show some activity that kept you up to date in the area of your field.
If you are going into retail or fashion, then tell them of following and reading fashion blogs to stay up to date. Or reading ...have you done any reading that would be relevant have you learned any new computer skills. Did you volunteer at school or pre-school ? What did you do ? You don't want to list every task but you want to be general in your cover letter that you did things. Then if you get an interview, you can always "joke" around that you really learned about following a budget or prioritizing tasks to keep every one on schedule, etc.
This is very common today - so most people don't look at it as dropping out anymore.
GOOD LUCK