The college most likely has a counseling center that she can go to for free treatment. If she is attending college out of state, you may phone your insurance company to find out if she would need a "guest membership" while away or not. The ins can also give you in network referrals.
As long as she is willing to get help, she can work with any clinician such as: counselor/therapist, social worker or a psychologist. A psychiatrist will be someone who would generally prescribe medication such as antianxiety medication. Her frequent urination may be related to high anxiety levels as well as other causes i.e over active bladder, Interstitial cystitis, kidney stones, diabetes, etc.
If the urination is connected to her anxiety, she can work with a cognitive behavioral therapist. Usually this involves goal oriented short term treatment that would address what is behind her anxiety and how to manage her symptoms.
If she's noticed that the frequent urination occurs even when she is not anxious/stressed out, she can have her GP check for medical causes for it. Her GP is another person who can prescribe anti anxiety medication if your daughter wants to try that option. There are also medications that for the time being can help control her frequent need to urinate such as Vesicare, Oxybutin, Gellnique patch, Toviaz, etc.
Thank you for clarifying. That is then connected to her anxiety level. The fact that she feels like she has to go also can increase her already pre-existent anxiety.
She can respond well to both medication and counseling. Of course, she can decide to try either one. A counselor would be someone who can help her learn how to manage her anxiety level, while the medication would address her physiological reaction to it.
There are also natural supplements used for anxiety such as: L-trytophan, Lady's Slipper, Lemon balm, kava-kava to name a few.
Individuals struggling with anxiety also practice abdominal breathing and monitor their internal dialog (what she is thinking, how much she spends on anxiety provoking thoughts and the ability to redirect her thinking) The next step would be for her to see a counselor and then if she can decide whether or not she wants to take medication as well.