Is it permissible for my mother to slaughter and give charity after her waiting period has ended?

Islam encourages charity and promises abundant recompense and return to those who give it. Allah Almighty says: "Who is it that would loan Allah a goodly loan so He may multiply it for him and he will have a noble reward?" (Al-Hadid: 11), and "But whatever thing you spend [in His cause] - He will compensate it; and He is the best of providers." (Saba: 39), and "The example of those who spend their wealth in the way of Allah is like a seed [of grain] which grows seven spikes; in each spike is a hundred grains. And Allah multiplies [His reward] for whom He wills." (Al-Baqarah: 261). And in the Hadith: "O Allah, give recompense to the one who spends, and give destruction to the one who withholds." This reward encompasses men and women in all times and circumstances.