HELP! she won't nap!!

My 4 month old sleeps well at night. I put her down at 10 she wakes up at 3, then 6, then 9. But I can't get her to nap for more then a 30 mins at a time. An hour if I'm lucky. What can I do??! She's tired and I get nothing done all day!!

This is her I don't need sleep face.