Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh
In the Name of Allah, the All-Merciful, the Mercy-Giving
All praise is due to Allah. Peace and blessings be upon His Messenger Muhammad.
You should warn your sister against the evil consequences of apostasy. Almighty Allah says what means “And whoever among you should turn away from his religion, then die while he is a disbeliever- the [good] works of [the likes of] these are [rendered utterly] futile [with God]- in this world and in the Hereafter- and these are the Companions of the Fire [of Hell]. They shall abide therein forever.” (Al-Baqarah 2:217)
Perhaps she has some misconceptions and needs to talk to an imam or a scholar.
Apostasy deprives a person of his/her rights in the Muslim community. Therefore, your contact with her should be for the sake of dissuading her from this ruinous decision.
You may also help her with this loan with the intention of drawing her heart toward you hoping that she might listen to your advice.
Almighty Allah knows best.
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