Access to Group Forms

Hi I'm new to Forms, if I create a form in Group forms are members of that group the only ones that can access it? I tried looking for the answer but can't seem to find any info on it. 

My scenario is I created a survey in group forms so my team could collaborate on its content, but we want colleagues in our company to be able to access it. I sent the link to a co-worker who's not part of the group but works for the same company, and when she clicks the link she gets a permissions error. Could she be getting the error because she's not apart of the group?

Any help would be greatly appreciated!