Sounds like a severe case of hormones flying, your doctor will be able to help with treatments for this. Out of control hormones are extremely destructive and have ruined many womens lifes, she will need to learn to spot the signs and develop tactics to cope but that will take time and lots of your patience. Low self esteem etc can be a consequence of it all so a therapist to ensure it doesn't develop into a permanant thought pattern would be a good idea.