Red stem

well pragmatically said, if you harvest in afew days, dont care bout some red stems, most ime its an genetically thing

If the stems are red all the way around, it's a phosphorus deficiency. If they're still green on the otherwise, it's a sunburn, which is normal. If you're harvesting in a few days, no point in fixing nutrient issues. Looks like you have some foxtailiing though, which means your light is probably too close. Guessing she surprised you during the transition and you ran out of room to move up the light?

No, it isn't a problem. That sometimes happens at the end of growing. The bush look juicy, grats :)

Bro se debe a que comen los nutrientes de las hojas estas toman ese color al final de la flora totalmente normal saludos bro buenos humos desde chile