Shes already a large plant but them stretchy internodes could indicate a low yield. Windows are the worst place for a cannabis plant windows protect hoomans inside by filtering the intesity of uv light coming through now we dont see uv light but plants do so filtering out that light is only slowing her down. We as growers all work with what we have but if you have a grow light I would stick her underneath it leaving a 30-50cm gap and turn the intensity of the grow light down to about 75% straight away try and improve the spacing between them internodes and getting more branches for a bigger harvest :) Though for a first grow this is great my friend :)