C.J.
A fun alternative to a walker that helps her develop stability needed for walking are the exersaucers. The older/stronger they get you just move the stability legs up and it gets more wobbly. As a result the child must use their own body stregth to "right" themselves (think those exercise balls for adults) it is small and consistent movement that will strengthen her core for walking and balance.
you can typically find these for sale at toy resale stores, ebay and craig's list in great condition. I never bought a new one and we got two for under $25!