Is this enough for my sort-of-sister-in-laws baby shower?

Oh wow! That all sounds great! I would love to receive all that at my baby shower! At the end of the day though, its the thought that counts and i'm sure your sister-in-law would be happy with anything she receives from you! She would probably just be glad you attended! But yes, your gift sounds wonderful! Hope it's an awsome day! :o)