It seems to be panicky attack due to stressful situation. It needs to be treated asap otherwise it may get complicated. It can be well treated with counseling sessions and medication if required.

Hi... Please consult a Psychiatrist first if the situation is so acute. What you have explained looks like a panic attack (freeze response) but there might be some other conditions as well. Therapy takes time, so consulting a Psychologist for immediate effect is not ideal. Though ultimately Therapy will treat her from the root but it will take sometime, i.e., 6-8 months to 1-2 years depending upon the severity of concern. Medication brings effect immediately and she will also feel equipped to deal with her immediate environment. Therapy and Medication will go side-by-side in this case but considering the severity of her concern Medication may take primacy.

Hello dear I can understand what your sister might be going through. It might have been very difficult for her to cope up with such situations simultaneously in her life. She had emotional outburst and panick as a sign that she isn't able to cope up with this. Don't worry, you did a very good thing to think about taking her to consult a good therapist or a psychologist. You should do it as soon as possible. You can also let her contact me and I will help her in her recovery. She can discuss her problem with me so that she can reach towards her solution. Take care. Stay safe and strong. Everything will be alright. She got this!!

First pls talk with her. Don't panic. Try to understand her issues. Calm her. Then consult with a Psychologist.