Is it permissible for a woman to slaughter the sacrificial animal on her own (i.e. without the assistance of a man)? Will her Qurbani be valid?
If a woman knows the proper method of slaughtering, then it would be permissible for her to slaughter the sacrificial animal by herself. However, if she is not usually involved in such tasks, and it is possible for her to err in cutting the veins of the sacrificial animal, then it would not be appropriate for her to perform the slaughter herself, in fact, she should delegate this task to another Muslim who is capable of performing it.
And Allah knows best.