Placing the prefix "un-" in front of an adjective generally negates the adjective. For example, "unhappy" means "not happy", "uninspiring" means "not inspiring", and "undiscommoded" would mean "not discommoded". Since "discommoded" means "made uncomfortable", "undiscommoded" would mean "not made uncomfortable". A life "undiscommoded by orphans" would mean a life not made less comfortable by orphans.

But it is undicommed not discommed it has un at beginning

To discommode means to cause someone inconvenience or trouble. She can't imagine the lives of people who haven't been surrounded by orphans causing them inconvenience or trouble.