Is there any saving this plant?

Not likely.. Looks like major light burn... that's why the leaves turned white. Also, see how the leaves (therefore, nodes) stacked directly on top of each other? You shold only have a pair of leaves (later just one on a more mature plant) at a node. It looks like you have 3 or 4 pair all coming out at the same location. Not being mean. These are things you can observe and react to now. A new seedling needs light, but not torched. Within a day or two you'll move that light from 30" to 24" or so (ymmv - LEDs are usually this distance, for example). If you see it stretch, you know to move it a bit closer, but don't drop the light too fast or too far the very first day. If it makes you feel better, my aunt did this her first grow too. Once you find that 2-4" range of a sweet spot (like 20-24", not 2"-4"), just let plant grow into it and raise 2-4" at a time. autoflower? it's toast... you have ~5 weeks or a bit more left. It won't do anything useful in that time. Just for experience, try to raise the light and get it back into health. I'd raise it to 30" initially... allow it to recover for afew days and see if color starts coming back... even then, wait for some stretch before lowering it back down to ~24" (or whatever is suggested for your type of light source) May only harvest a few grams, but you'll see how it ripens, maybe get a look at some trichomes with a jeweler's loupe to guage ripeness and learn for the next one... If you have another seed, you should feel safe that you won't waste it planting it right now. that thing won't take up any more space, for the most part.... even if it does you'll favor the new plant 100% for certain. Allow the plant to dictate what you do. Watch how it racts when you change things... keep it simple. And, defintely keep that light further away... significantly further.