TRACON Controller reported an aircraft on approach descended below the glideslope and the minimum vectoring altitude. As the pilot seemed to be behind the aircraft; the controller provided delay vectors for the aircraft to ensure an easier and longer approach.

Narrative

Aircraft X was on a missed approach off ZZZ as they could not get the field in sight. There was Aircraft Y on approach into ZZZ1 that would have conflicted with Aircraft X as they were going missed and not responding to communication. I was late on noticing Aircraft X was going straight out into ZZZ2 final and turned Aircraft X to avoid the heavy jet on final. Later I cleared Aircraft X for the ILS XXL into ZZZ3. As this was going on I was notified that an aircraft requesting [Runway] XYL into ZZZ4 was denied by both Area B and Area C as that would shut down ZZZ5 and ZZZ2. I noticed then that Aircraft X was not on the glideslope and descending into a 047 MVA. I issued a low altitude alert and climbed the aircraft. I decided at that point to delay vector Aircraft X as I wanted to ensure an easier and longer intercept as I was not confident that Aircraft X would be able to do the approach if pressed and sequenced between the other aircraft landing ZZZ3 and trying to jam them in the sequence. I believe the safest course of action was to delay vector Aircraft X as it seemed that the pilot was behind the aircraft and best for the pilot to give them an easy approach into ZZZ3.