We won't get sick of your questions, guaranteed
We appreciate pet owners that want to provide the best for their pets. There are a lot of people that are set in their ways, and aren't so accepting of the information.
I caught this post late, and I think you have already gotten tons of great advice to get you on your way.
I just want to give you some extra encouragement in offering the veggies. Pigs who are new to them can be pretty stubborn at accepting them, but eventually they will. You will enjoy the excited wheek wheeks she makes to beg for them, once she catches on to the being yummy. The best thing to do is to pick a veggie and keep offering it until she accepts it, then add another veggies until she accepts it, then another....take it one at a time. The best to start with is fresh grass and leaf lettuce. You may can squeeze the juice from an orange or strawberry over the lettuce to entice her. Cilantro is also good, and red and green bell peppers are one of the best veggies for them, but can be the hardest to get them to accept. You can try putting some lettuce in her hay rack ...it may help her associate it with being food. At this point she just doesn't understand what they are.
Some walmarts carry the grids, some don't. Noe of my walmarts do
Target has them occasionally. If you have the ability to order online, walmart.com has pink and purple ones on clearance right now for 10.87 box. You probably won't need over one box of them, maybe two depending on the size you want to build.
I hope Shelby gets treatment and you are able to take her back from Petco. I would call and worry the crapt out of them every single day. Otherwise, they are likely to never treat her. They don't bank on most people wanting sick animals or to ever come back to retrieve them, so they just cage them in their back room and wait for them to die, giving them little or no treatment. It is really sad the practices they carry out that most people don't know about.
Keep us posted on how things go, and when you get your cage built. You will be suprised how much Layla comes out of her shell with more room to play and live in.