If your daughter was under age and was solicited by a company using this Conference service How did they get her number to text the conference number and further more why wasn't the charge removed by the phone company
This number for conferences hangs on to your phone long after your call has ended gaining access to your calls after you think you have hung up and they are also known to block you from making calls or receiving calls because they have your line tied up and in some cases charging you, The charges is the Con the Business is supported by the charges there probably is not a real or legal business the other part of the Con is gaining access to your cell accessing people contacting you. So you should call these agencies go to their websites FTC.Gov  or , the FCC.gov and file a complaint against both your cell carrier and the company charging your phone if you don't know who the company is just put the number called they will get to the bottom of the owners of this bridging service and the company's using it