Can I Use De Solv It to Remove Latex Paint from Clothing?

My wife was painting a fence out in our back yard area, and didn't notice until sometime later she had gotten some paint on her blouse.

The paint is a water based outdoor paint used for painting such things as a fence or other wooden material. The paint has dried on her blouse, and we are wondering what is the best way to trying to remove it from her blouse.

She suggested using the product "Disolve-It" which is a citrus based stain, etc. type remover, but I am afraid that it might set the paint into the material.
Any suggestions?

By Lawrence J White & Elizabeth J White from New Westminster, BC, Canada