Boost her lysine up to 1000mg (500mg twice a day) for about a week before taking her in. This should curb any negative side effects. She's such a cutie and I'm so glad you have her! BTW, I have that same contact container! LOL
No, you can buy lysine OTC. I use the powdered variety from either NOW or VitaCost. Anytime I know that my kitties will be doing something out of the ordinary (going to the vet or traveling), I up their dose to decrease the effects of the stress.