Toilet Training

My dog is 4, had her 2.5 of those. She wasn’t toilet trained when we got her and initially would have some accidents if not let out during the night. She is much better now but has a habit of asking to go out at around this time every night (2.30am!) that’s after walk / lots of wee’s before bed around 9pm? I know she could hold it, but is it fair to ignore her (which is what I would need to do to get her out of this habit!!?) or should I just be grateful she’s stopped going inside? She sleeps downstairs and is quite needy so I suspect part of the habit is that she wants to see us (I don’t interact with her at this time just let her in / out).