Im going to give my IPhone 6 on Verizon tomorrow and i wanted to know to put her number you just take out the sim card and put it in the 6 and if not what do you do?
If the Sims are compatible you can certainly do that.
You can activate online as well:
Activate Switch Device FAQs | Verizon Wireless
Yes. The SIM sizes are the same with the 5S and 6. Just take SIM out of the 5S and put it in the 6. That's it!