What activity should you do?
The best answer in this situation is to get the facts before taking any action. A violation based only on suspicion should not be reported. You can get the facts by telling your friend you’re concerned about the appearance of impropriety and ask her whether the vendor gave her these items. It could be that these are the first of several samples that will be coming from all the vendors bidding on the project so the equipment can be evaluated in light of the project objectives. Or she could have accepted them as gifts, which is not appropriate. Never jump to conclusions. Always ask and get the facts straight before reporting a conflict-of-interest situation.