Do you necessarily have to have all symptoms to have the Corona Virus?

Just about two weeks ago my mom started coughing a lot. We weren't that worried, but then it started getting worse, where she warned us to not get close to her, and she started to feel very tired and little to no energy. This has been occurring for the past two weeks, and the coughing doesn't go away. She has been out at the beginning of the outbreak but that's the only two symptoms she shows. We're just confused about whether she has it or not, and we want to be for sure if she could have the possibility of having it for her to actually get tested. It doesn't go away and that's what's worrying. It would be nice if anyone could help. Thank you!