Won't nap

One of my 11 week old (8 wks adjusted) twins refuses to nap. It's getting worse and worse by the day. Tried different swings, different swaddled, wearing her in a soft carrier... No luck.  She is a mess by the evening until she finally falls asleep at 9-10. She sleeps good at night, with a feeding at 1 and 5am. Anyone else have this problem? Anything work? We just put blackout shades up, hasn't helped yet.