All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
First of all, we console you and we say to Allaah belongs what He took and to Him belongs what He gave, and everything with Him has an appointed time, so be patient and hope for Allaah’s reward. We ask Allaah to forgive and have mercy upon your dead and reward you because of this calamity.
As regards delaying the burial, according to the Sunnah, one should hasten to bury the dead as the Prophet said: ''Hasten to bury the dead.’’ [Al-Bukhari and Muslim] This is the principle in burying the dead, which is to hasten and take the initiative to bury him/her unless there is a sound reason for delaying the burial.
Among the sound reasons of delaying the burial of the dead, is waiting for his/her relatives to come as long as this is not for a long time. Some jurists stated that it is permissible to wait until the relatives of the dead, his/her friends and other people would gather provided this does not cause any difficulty for them and provided that it is not feared that the dead would decompose. However, some jurists issued Fataawa that it is not permissible to delay the burial of a corpse in order to wait for one of the relatives of the dead. Nonetheless, if there is a necessity for delaying the burial, then this is permissible as per the Fatwa of the Permanent Committee.
However, we hope that your family is not sinful for delaying the burial of your mother and for waiting for you.
As regards putting the dead in the freezer and whether or not he/she feels cold, then according to the view that it is permissible to delay the burial for a necessity, then it is permissible to put the dead in a freezer; rather, it might be that this is an obligation in order to prevent him/her from being decomposed. However, we can not authoritatively say that the dead feels cold or does not feel cold in the freezer as this is a matter of the unseen, and we are not aware of any Islamic evidence which proves or denies this.
For more benefit, please refer to Fataawa 90835 and 84867.
Allaah Knows best.