Answer:
Continue to support the team's decision on sizing.
Step-by-step explanation:
Before rolling out a product by a company, there is what is called user story which is usually being deliberated by the product team. The purpose is to ensure that the specifications as contained therein is in line with what customers wanted and same is well understood by the parties involved before rolling out the product.
A product owner who feels the team is wasting time has no option than to support the team's decision on point sizing because she is a member of the team. Moreover, the team has to come up with the best user story after point sizing and deliberation.
Also, as a product owner who is also part of the product team; they are known to be team oriented hence must continue to support whatever decision that is made by the team.