It could be both - external environment + internal 'landscape'.

Can she get individual support as well? Such as counselling. It might be worth her having a safe space with someone offering a supportive presence and to equip her with tools to live in a harsh (sometimes, cruel) world.

The way you describe her makes her sounds like a sweet person but she can get her heart broken or be used/abused easily if she does not develop a thicker skin, or be more discerning re other people's intentions etc.