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How great is the risk? Probably not that great. But why take that risk when there simply isn't any need to do so?
The correct question is not whether there is a NEED - that's the old chestnut used to shift discussion on why people NEED AR-15's.
The issue with lead is that very small amounts can have a negative impact on brain development. This is well documented with young children, and one can reasonably assume the impact would be at least as great on a pre-born.
Those are two completely orthogonal issues.
She wants an LTC. She can get it by taking two different types of courses -- ones with live fire, and ones without. The ones with live fire contain some added risk that is hard for us to quantify. The ones without live fire do not entail that risk.
So she can achieve her goal -- getting an LTC -- without taking that risk. So there isn't any need for her to take that risk in order to achieve her goal.