She can't. It was stated in the S1 finally, and Alex had to rescue her when she did just that, and whenever she goes to space in the later seasons, she has to wear a space suit.
With the unlimited power and strength that Superman and Supergirl, sometimes i do wonder why they got their asses kicked more than the punishment they be apply to opposition, their fighting skills are quite poor, most of times they take a good beatdown before applying some normal technique back. I do try to understand that to make the show enjoyable but sometimes they should end the fight with zero damage. All of ththesee clips placed together show that.
No se supone que todo lo que toca Superman o un kriptoniano que recibe el poder del Sol, e intenta levantar o mover está protegido de desgarro o rotura por estrés?
هو المخرج لسوبر جيرل والرجل العنكبوت الشخصيات التي تتبنى أفكار حسنة ونبل في مساعدة المجتمع تاركين رؤساء وسياسيين جهلة لماذا هيودوا البشر في مصيبة إلى مالانهاية ومتشغلش بالك بي لأني في هذه القصة سأكون شرير جدا حيث أنا أجمع الوقود الدائم وعملت جميلة للببنات الحلوة
Laura Diane Vandervoort was, is and ever will be the best Kara Zor-el/Supergirl of all time. NOT THAT FEMALE KAL-EL/SUPERMAN. Honersty who need´s two Superman´s ?