Lot to unpack here. I’m going to try to hit a handful of points that hopefully will be worth your time.
Women don’t take formal PCT drugs the way a man might; their natural estrogen and testosterone doesn’t need any stimulus to restart beyond cessation of exogenous hormones. Yes it will still be a transition. I have heard of women using some Ayurvedic herbs common in menopause to help feel a bit better, perhaps something like DIM, but ultimately it’s just a ride everyone has to take. Try to stick to your diet and training routine per usual. Whether or not your period comes back normally, or when, is totally individual - plenty of women are fine, and plenty have issues, just like women who don’t use AAS.
Ostarine I have heard of women going as high as 20mg a day and reporting feeling fine and not experiencing virilization. One of the members here, @love2liftkat has used it successfully on a bulking phase. My wife has no experience with Ostarine. Low doses of LGD she has, something around 5mg daily, for something like 4-6 weeks without issues besides mood changes (more irritable, but she adjusted and again everyone is different - I get irritable when I first go on cycle usually).
Anavar is great and her bread and butter, but it will virilize you some, same as all steroids, if you take enough for long enough. If you exceed 10mg, expect permanent voice deepening at some point. If your throat ever gets scratchy, that’s your voice changing and you need to stop immediately to hopefully prevent further progression if you aren’t prepared to accept that forever. 5-10mg for 4-8 weeks is probably a good dose for earlier female cycles.
Testosterone I believe has no place in a female cycle beyond a replacement dose for wellness, except for advanced users who have accepted significant levels of virilization to pursue their goals. As in someone already injecting other steroids might stay on 4-8mg a week year round, and that isn’t going to meaningfully promote growth in a women using 200mg NPP a week for her bodybuilding. But trying to grow with testosterone is just a poor tool for the job outside extreme scenarios.
If you are curious to experiment then the SARMs are an option, but Anavar is the tried and true option. Always test your Anavar to make sure it’s not Dbol or something; this happens from time to time, and it has happened to me. Roidtest sells Oxandrolone replacement test kits for about $30 on their website (you just need the replacement; it’s actually standalone) and they have very easy instructions to follow to test your gear. I would test all your steroids that way if you ever buy oil to inject, like primobolan or NPP.
Also, 15-20lbs on 5’3” is a huge weight increase. My wife is 5’4”, and if she is going up over 10lbs in several months even she is definitely getting fat. This is great for me as she is sexy with more curves, but poor when her goal is lean mass acquisition. Don’t focus so much on adding pounds to the scale; if I go up 20lbs I am getting fatter for sure even (and I’m 267lbs currently). If you add 5-10 lean lbs, you are going to see some great improvements on your frame, I promise. Adding excessive fat means you will have to diet harder to get in shape.
Lastly, Clenbuterol at 20-40mcg is a great anabolic for a beginner woman. My wife still uses it sometimes as a bridge between steroids because it promotes lean mass retention and lets her eat higher calories more similar to when she was on cycle. You could run 20mcg Clen daily for a month, then switch to running Anavar for 6 weeks at 5-10mg, then switch back to another month of Clen at 40mcg now while your hormones bounce back so you don’t add so much fat as estrogen rebounds some. That’s about a 14 week course of overall enhancement that also helps smooth the rebound from impacting your physique as much. Clen is no steroid, but it has positive anti-catabolic traits that will add up if you are sticking to your diet plan.
HGH means you are pinning daily, so not a great option for you, but if you can wrap your mind around using an insulin needle once a day it’s a good relatively healthy option.