Hello Thomas, my name is ***** ***** I will be the immigration attorney helping you today.
Unfortunately Ivon cannot petition her mother until she has turned 21 years old. Also unfortunately,there is no visa set out for a parent of a Us citizen child to come to the US with them. Lisa would have to find her own basis to qualify for a visa or her own green card to be able to come to the US.
If it's just to come and visit, she may consider applying for a B2 tourist visa. If she wants to study, she can apply for an F1 Student visa. If she is a professional and has a job offer, she can consider the H1B visa or other employment ones are the L1, H2B and J1 visas. She can read about all of them here http://www.uscis.gov/working-united-states/working-us
If she rather come more permanently, she would have to qualify for one of the ways to get a green card. I'm assuming she has no other family that can petition for her. The other options would be employment which would also require an employer to give her a job offer and then to do a Labor Certification for her which is a rather complicated process to prove that there is no US worker that can fill the position she is being offered. Other than that she can get a green card based on investment of at least $500,000. Another last two options are to apply for political asylum or to get picked in the Diversity Visa Lottery.
Good luck to you during this process and I hope this answer has helped you!
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