S.L.
Sometimes cold medication and other medications make children the opposite and they get more hyper instead of sleeping. My opinion is not to give that medication to children. I would talk to her doctor about what he thinks but something is bothering her. I would give her a nap much earlier in the day, or even two, so she may be overly tired. A one year old sometimes will take a short morning nap or an earlier afternoon nap like right after lunch like 1 p.m. Not much later or they'll sleep and be up too late then. Put her down then around 8 p.m. and put on some quiet music until she calms down some. I would try to be as quiet as you can be but not so quiet she hears nothing and she should be tired enough to sleep. If not take her to the doctor, a good pediatrician or good primary care to see their advice.