LO refuse to nap

My 3.5months baby refuse to nap. She sleeps ard 7-8pm and wakes up ard 5.30-6am everyday. She doesn't take any nap longer than 30min. I tried many rockers, bouncer and even yaolan but still don't work. She will only sleep if she is in my arms. But she will perspire a lot. What shld i do?