I bought this Mountain Magic plant 3 days ago. The woman at the garden store told me to wait about a week to let the ground warm up before planting. So I gave it still in the pot near where it will eventually be planted. It looked fine 3 days ago but now the branches are all limp and the leaves are curling.
I would plant the tomato. It seems a big plant (a lot of leaves) for a small vase. Probably it needs more water and fertilizers. But it will recover. On worse case, you will have a delay of a week in harvesting tomatoes.