I think she is a great sleeper! Babies often have a time during they day they are unsettled and it is notoriously in the late afternoon. Perhaps use this time to have her in a carrier on your body if you really think she is tired. That way she can nap and not be left alone. Otherwise perhaps use this time for an activity that is relaxing BEFORE she gets cranky, eg a bath, massage, reading a book etc.
HTH.