Hi, My 25 Year Old Daughter Was Having Anxiety. Her

Hi, my 25 year old daughter was having anxiety. Her doctor doubled her Zoloft from 50mg to 100. She took .5mg of Xanax 3 times a day for about 10 days. Then lowered to maybe 1mg total to .5mg total a day for the next 6 days. The last 5 days she took .5 a day to none a day. She hasn’t taken any for the last 4 days and is experiencing pretty bad headaches. And anxiety. Is she experiencing withdrawals from the Xanax? Is this dangerous? Should she get back on and taper off!