Short term investments for $30K

[Rooster71]

My girlfriend has an online account paying a little over 3% which contains about $30,000 which she plans to use for down payments on investment property within the next few years. No deals are currently in the works, but the funds need to be accessible within 30 days notice (that is why they are in a savings account).

Any ideas on short term investments that may provide better than 3.5% return and that can be accessible within 30-60 days without penalty or substantial chance of loss of capital?

Thanks