Or if she is willing to pay for the lounge access.

BTW The lounge attendants usually say that it is more convenient to use the Schengen lounges (with no showers) but one may enter the non-Schengen lounges. This is because at the time when the Asian flights arrive the queues to the passport control are long. Later they are not. It helps if you have an EU or Schengen passport. Even more so if you have an e-passport. This worry does not apply your friend. Because you say she has a long lay-over in Helsinki.