02-13-2011, 02:23 AM
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If she only bucked once which got you off, that does not mean that she is now a bucker.
It's very likely that she was in some kind of discomfort if you just got on and she started bucking. Her back may have been out, or maybe she even had something as simple as a grass seed under her saddle blanket that was stabbing her in the back.
I would put her on the lunge, and then get an experienced rider to have a few rides on her before you get on. If she is not in discomfort she's probably not going to do anything wrong if she has always been very quiet like you say, but if you get on her feeling very tense and nervous and expecting her to buck, chances are she WILL!