What Tests Are Required To See Whether Sores Are Caused By HSV?

My 83 year old mom became ill in March 2016. She had a sore on the corner of her mouth and an bump on the bridge of her nose. She became fatigued 10mins at a time at which time she just fell over on the sofa and was out for at least 10mins then came out of it and would say isn t that weird Then she became delerious of the next few weeks and I had her checked out at the Hospital at which time they could not give me any answers. I am wondering if by an change she has HSV. I have read about the possibility of HSV casuing inflamation in the brain which results in Demencia. Please let me know your thougths and if there is any specific test for HSV and if so how to get her tested. Thank you, Helen