I find neither workout to be laughable. Both are clearly maximal workout, but may be within the realm.
In 1979, I was a 1:58, 3:54, 15:30 guy (at age 18). Right around Brenda's times (except for the 1500).
I could have run those workout (with enough rest), but they would have been race like efforts.
I once did 5x400 with 5 minute at 55, 55, 55, 57. Followed by 12x200 at 28 (maybe getting more like 30 the last few). I'm pretty sure I could have done 3 all out 400's, followed by a 300. As long as I had 5 minutes.
Repeats are easy for a miler. 4xmile at 5:00 is not that hard if you can run a 4:20is or better mile. Especially with a 3-5 minute rest. Then with a 10-15 minute rest, I could see running a 5k (on the road) close to my race pace. Especially as I was not (nor is Brenda) a 5k runner - meaning our PR may not be representative on what we could do on the right day. I'm pretty sure I could have run about 15:00 on the right day (as I ran 14:30 a few years later when I was a 3:50 guy), and I'm pretty sure Brenda could be close to that as well.
Would those be every week workouts? Heck no, but one the right day and with the intention of be max efforts, they are doable for Brenda (IMO....and as long as she is capable of running around 52 low to mid for 400).