She should asses her risk tolerance and pick an asset allocation accordingly. Assuming 80%+ cash is really not where she wants to be:
If she wants to stay at Schwab, a near-dated target retirement fund might fit the bill. 2015 target-retirement is currently 50% bonds / 50% stocks and would slide further towards bonds over time, for example.
If she is willing to roll-over, Vanguard has target date funds, and life-strategy funds. She could go 20-80 or 40-60 in the life-strategy funds for a conservative allocation.
These are easy funds to own - rebalanced / reallocated automatically.