Short, straight bill; long wingtips extend past tail.
The red feathers in the center of gorget had me puzzled at first, but
Williamson in "Peterson Field Guide to Hummingbirds of North America" states that some adult
female Calliopes show this. Immature males are more variable, see comments below. Long wingtips extend past tail.
Here, one can see all ten retrices. Randy Podoll pointed out that the light feather edges on the head indicate a juvenile. Apparently the gorget in young males can also look like this, although I would expect more of a male-type pattern like the Calliope that was in Dan Svingen's yard last year in October (see this LINK). The Pierre bird was older and probably had more development of the gorget. On this bird, R1's appear black, so now I'm thinking this is an immature male Calliope.