Yep - I agree with all of the above. However, tread with caution. In many cases, her meter is still running. Its just not visible.
When they establish some sort of connection with a gringo, they love to invite you over. This gives them the chance to show you how they live. Its usually a very meager, but clean house.
But, they are intentionally pulling on your heart strings. You'll trade emails. The RFMs will shortly follow. Do yourself a favor and don't honor her RFMs. Have fun, but pay her for her time. Don't send money.
_________________
http://TipsCostaRica.com for pratical advice on living in Costa Rica.
In order to write about life, first you must live it! - E. Hemingway.