Yes, that is the correct place and only place that you need to have her change the IP addressing, provided that:
1. She does not use a 2nd router that is set up behind the 3801HGV router. 2. She does not have additional static IP addresses assigned to her account.
I would also recommend changing the settings as follows:
Router address: 192.168.201.254 Subnet Mask: 255.255.255.0 First DHCP Address: 192.168.201.64 Last DHCP Address: 192.168.201.240
.254 is the standard/typical address that the 2Wire routers use (they default to the last usable IP address in the subnet rather than the first as many routers do), and their default DHCP range starts at .64. I recommend ending the DHCP range at .240 so that .254, which is the router's address, is not part of the DHCP range.
One the settings are typed into the 2Wire router and the Save button is clicked, she will lose communication with the 3801HGV and lose Internet until she reboots the computer so that it picks up an address out of the new DHCP range.
If she has IPTV service on this account, she will also need to restart all TV boxes.