For proofs you can either scan and email all to your wife; she can then print it and TCS it to Pakistan for RS120. Or you can send it directly to Islamabad using FedEX but that would cost you quite a bit. Send your proof of visit including copy of your ticket, boarding pass, passport stamps, include updated calls history, emails etc. For pictures together 20-25 is more than enough just include a good representation of you two, your families and friends, outings together, dinners etc...
For visit visa some one else might be able to answer better who has been here before. I think she has a strong working background so she shouldn't have any problems getting a visit visa...
