If her target retirement date is 2045 and you don't need to diversify against other investments,then the2045 is great! Buy and hold.
Alternately, if you consider your TSP and her investments as a joint portfolio, Vanguard REITs might be a good choice. REITs have asolid historic average return, relatively low volatility, and a low correlation with the TSP stock funds. Consequently, they provide very nice portfolio diversification. The usual REIT portfolio recommendationis 12% or less.
Finally, an emerging market index fund provides high returns, high volatility, and low correlation with the TSP stock funds. A small percentage goes a long way. However, emerging markets also provide great diversification against TSP funds.
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