Put her in something that she wore before the change/addition to detergent, see if it clears up. Then if it happens again you'll know its possibly the oxiclean.
If I'm not mistaken, any food allergies start at chest/neck and work their way up. Introduce any new foods?
Are sweet potatoes new to her? If so just keep an eye in it as she may have an allergy to them. However, I'm certain food allergies start on the chest and back and work their way up.
I wouldn't panic, it could be coincidence. I quickly did a google search just to get an idea of food allergies. If you are concerned, phone the pediatrician and ask them what to look out for. Sweet potatoes is not in the high allergy group.
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If I'm not mistaken, any food allergies start at chest/neck and work their way up. Introduce any new foods?
http://www.m.webmd.com/a-to-z-guides/introducing-new-foods
I attached the link for a little peace of mind.