If she is going to be doing mostly little kids (10U), then the high priced protectors may be unnecessary and too much too soon. My DD tried umpiring and she preferred the cheap ribbed style protector. She was small, like your daughter, and she was able to easily trim the bottom of the protector to fit so it didn't push the shirt below the belt line. A lot might depend on how intimidated she is behind the plate and whether the larger protectors (e.g. UMP, Kook vest) will make her feel more protected.
The Honigs K2 (which I personally use) leaves too much area unprotected for a novice umpire, IMO.
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Tom
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