Can one see a sister in Hellfire and pray for her to be released into Paradise?

Love for the sake of Allah is one of the strongest means of salvation on the Day of Resurrection, for those who love each other for Allah's sake will be shaded by Allah in His shade on a Day when there will be no shade but His. And the continuation of love for a sister in Islam, for the sake of her righteousness and religiosity, is a continuation of Allah's guarantee to shade those who love each other for His sake. It is sufficient to remain steadfast in faith and sincere love for Allah for the lovers to ask Allah to gather them in His shade and admit them into Paradise. And Allah will intercede for whomever He wills among the believers, concerning whomever He wills, on the Day of Resurrection.