Originally Posted by
Synnen
I know you don't want to spend money, but the surest way to find her is to hire a licensed private investigator. They can often take the information you already have and find a person in a relatively short amount of time for a reasonable fee.
Otherwise, sometimes how successful a search is depends on how common the name is---and whether they are even using the name anymore. There is nothing illegal about using an alias as long as you are not using it to commit fraud. Jenny Smith is going to be much harder to find than Hebzibah Vander Smelton-White.
Other than hiring someone to look, my only real suggestions are to look for any variation of her name (or any name you suspect she might be using) on social media websites.