The wiki is a great resource for pledge package information here

Ursaphant rider packs should have come with 3 sparks of life. 1 for the base game, and 2 additional ones.

Your wife having 4 may be due to participation in events like raiders of the lost vault where the possibility of snagging a free spark were possible, or may be because an extra one was bought in the store, but for a base ursaphant package your total of 3 is correct :D