Out of the 3 you posted, none offers a good configuration for her needs. The Sony has good specs but its GPU won't handle any gaming while the other two have a GPU which can handle minor gaming but with only 1GB of RAM they won't be much fun.
Try checking out the Dell Vostro series. They offer considerably better value. This configuration for example is much better than any of the notebooks you link to (the GPU alone is much faster) and it still is cheaper:
Code:
Vostro 1500 : Subtotal 988$
Intel® Core™ 2 Duo T7250 (2.0GHz/800Mhz FSB/2MB cache)
Genuine Windows Vista® Home Basic
15.4 in Wide Screen XGA+LCD Display w/TrueLife™
2GB Shared Dual Channel DDR2 SDRAM at 667MHz, 2 DIMM
160GB 5400RPM Hard Drive
8X CD/DVD+RW Read and Burn CD and DVD
256MB NVIDIA® GeForce™ 8600M GT
Dell Exclusive MediaDirect™ Instant Play Software Application
Dell Wireless 1390 802.11g Wi-Fi Mini Card
Integrated 2.0 mega pixel Web Camera