Does a full sister inherit from the apartment that her brother bought with his own money for their deceased sister?

If you bought an apartment and gifted it to your sister, and she took possession of it, then after her death, it is to be divided among all her heirs as an inheritance, and you do not have exclusive claim to it. However, if you bought the apartment and let your sister live in it without gifting it to her, then the apartment remains your property and is not an inheritance for her heirs.