No, her access to the court system is not limited.
Explanation:
Tina decides to take her claim against her Internet service provider to an online dispute resolution provider because her case may be solved more quickly than if it were taken to the court system. As a lot of cases are taken to the US court system, online or alternative dispute resolution offers a quick solution to the dispute at issue. Through mediation, arbitration and evaluation, the parties are able to find a solution to their disagreement in a couple of weeks instead of years and the cost is of course lower.
Nonetheless, Tina may also access the court system. There is no limitation whatsoever.