Most of the time, a user can just place their finger on the message to read, swipe up or down and then accidentally tap it a second time and thereby like it.
What it really means when she sees your message but doesn't respond.
And there's no way for you to know it's a mistake unless they deliberately double-tap the message again to dislike it.
The point we're trying to make is that when someone likes your message on Instagram and doesn't respond, don't overthink it and start worrying about what it could mean. You can simply ignore it and continue with the conversation.
But if it's a big deal to you and you want to find out what's wrong, then read on to see why people might be liking your message on Instagram and not responding.
