On Monday when you ask your friend if you should dump The person your day and she said yes now on Wednesday she says no since you asked her twice and got two different answers in terms of Validity and reliability her advice is not

Her answer is not reliable.

Explanation:

Reliability and validity are two major concepts that are used to assess the standard and quality of response/research.

While validity of an instrument is the idea that the instrument measures what it intends to measure, reliability is all about consistency and whether or not results could be replicated.

While your friend's answer may be valid, it can't reliable because of the differences in her response within a short time.