What would happen to my friend if she teleported to mars in her earth clothes and no spacesuit.

You could stand on mars for about 6 to 12. So technically the answer to the question is “Yes, but not for long”. The real problem is not the temperature, not even the lack of oxygen but it is the lack of atmospheric PRESSURE that kills you first.

To die from cold takes some minutes, you can survive with no oxygen for a minute or longer. Proof of this is that most peole can hold their breath underwater for maybe as long as a minute. But with no atmospheric PRESSURE the oxygen stored in your blood and lungs does you no good because it can’t get into your cells or be metabolized.

Having oxygen is of no help because you need PRESSURE to force the oxygen through the tiny tissues in your lungs to get it into your blood. Also you need pressure to enable the biochemical reactions that use the oxygen. If you tried to pressurize you lungs with just a mask you’d rupture the lungs. You really do need pressure.

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.