Hello, I'm brand new here looking for some help
I received a orchid in the mail as a gift, this was during cold weather, of course it was somewhat stressed. The flowers died immediately, The crown fell off a few weeks later. Now a 'basal keiki' has sprouted just above the soil level. Now what do I do? Should I cut the rest of the plant off just leaving the sprout?
The "basal keiki" is actually a "basal growth" that shares a root system with the mother plant. Don't cut it off, you will likely kill both. Let it grow. This is one of the ways that monopodial orchids such as Phalaenopsis propagate themselves. They'll do this in response to losing the "crown" (the main growth point) or sometimes just because the plant is getting tall. Let it do its thing, eventually, if it thrives, it can bloom from that point. It's trying to live...
(A true keiki that grows from an old flower spike can be removed once the roots are 3 inches or so. This is different, think of it more like an arm or leg... not capable of independent existence so don't amputate)