Hello, my name is ***** ***** I will be the immigration attorney helping you today.
Yes, the F1 is definitely the visa for this. To begin the process she needs to file the I-130 petition for her daughter. She does not need a separate one for her granddaughter. She will be automatically included. The form has a fee of $420 and can be found on uscis.gov It takes about 4-6 months for an approval but then after that unfortunately there is a long wait for there to be a visa available in the category. Right now the wait is about 7 years. The sooner she files it, the sooner she can hold her place in the line. Sometimes it speeds up but this is the wait time right now.
Good luck to you during this process and I hope this answer has helped you!
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