Free: Contests & Raffles.
40-60 lbs cub is not really a cub anymore. She would have left it in a couple of weeks anyway. Good for you for not shooting if you were not sure though.
She will probably leave the cub when she goes into heat. With a boar running around in the area she might already be ready to breed. This would be really late for her to breed if she hasnt been bred already. If she is pregnant I dont think she will den up and give birth with an older cub there.