I don't think it's a good idea. It might be fun to try after doing this the regular way....but IMO results are too unpredictable with a high potential for disappointment.
I would shoot her using soft soft light. You want her to look sexy and have almost no control with Christmas lights. Weird shadows and casts are very likely so this would NOT be my main light source if this were my shoot. I'd use a softbox, umbrella, or bounced light as the main source.
Hope that helps
Marko
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