Given the pain has only been for about a month and on and off, I'd say continuing a stretching routine, but possibly increasing its frequency (I don't know how often she stretches, but if she can stretch 3-4 times a day, there is evidence to show that that can be quite effective). Ensuring that she is properly warmed up before playing is also important and may alleviate some of her symptoms.
It sounds like the start-stop movement is the one that is causing problems and this may not be a tendon problem so much as it is tendon adaptation to frequent and sudden loading (since your wife probably started the baseball season about a month or so ago and may have only started going hard "recently"). Bill may have some idea of modifying her training a bit to address start-stop skills.
If the pain starts to intrude into other activities, becomes more often than off-and-on, or lasts for more than 3 months, then it could be something else. But for now, there's not a lot of information to determine much. Time will tell, as inconvenient as that is.
I would monitor frequency and duration of her pain in terms of when she has pain, what that game/practice was like in terms of how much she was doing sudden starts and stops and whether the duration of soreness is decreasing over time.
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) thought it might be related to tight hams and calves. 
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