Learn French: Elle est restée à la maison ; en effet, elle y est productive. - She stayed at home; indeed, she is productive there.

In French, en effet is used to confirm, justify, or explain what was just said. Here, it acts almost like "because" or "as a matter of fact," explaining why she stayed home. It confirms that staying home was a logical choice because she gets things done.

Could I use en fait instead of en effet here?

They are close, but they serve different purposes. You use en effet to confirm or explain what was just said (like "indeed" or "sure enough"). You use en fait to contradict or correct a misconception (like "actually" or "in fact"). Because the second part of this sentence strongly supports the first part, en effet is the perfect choice.

What is the y doing in elle y est productive?

The pronoun y replaces a place or location that was just mentioned, so you don't have to repeat it. Here, it replaces à la maison. Instead of repeating the phrase and saying elle est productive à la maison (she is productive at home), you simply say elle y est productive (she is productive there).

Why does restée have an extra e at the end?