U said she is in Massachusetts , Law says this
where the retail value of the goods obtained is less than one hundred dollars, shall be punished for a first offense by a fine not to exceed two hundred and fifty dollars, for a second offense by a fine of not less than one hundred nor more than five hundred dollars and for a third or subsequent offense by a fine of not more than five hundred dollars or imprisonment in a jail for not more than two years, or by both such fine and imprisonment. Where the retail value of the goods obtained equals or exceeds one hundred dollars, any violation of this section shall be punished by a fine of not more than one thousand dollars or by imprisonment in the house of correction for not more than two and one-half years, or by both such fine and imprisonment.
Source : https://malegislature.gov/laws/generallaws/partiv/titlei/chapter266/section30a
As you said its her first time ( either done or not ) they will fine her some money but record is big issue here. Hire a lawyer. Havent you seen in news even criminals will get lawyer?
Lawyer can ask judge to see video , you cant go and tell judge by urself. He will probably not even listen you.
Shop lifting is not big crime here. Dont worry.