HSA reimbursement

I have a question regarding HSA's.  I keep getting errors on form 8889 - guess I'm not answering the questions correctly.  My daughter turned 26 on 3/31/17.  She was covered on my employers health plan until then.  Starting 4/1, she was enrolled in her employer health plan, which is an HSA.  She is single - no dependents.  I am not sure what an HDHP includes. Perhaps my employer (Samsung) health plan is considered an HDHP.  Again, how do I answer the questions related to my daughter's situation.  Thank you for your help.