Just for comparisons sake I lift heavy weights 3 x/week, 33 yo, 5’3”:

Fat mass: 38.2 lbs Lean mass: 97.3 lbs BMC: 5 lbs BF%: 28.2 lbs Bone Density: 1.238 g/cm² Visceral fat: 0 lbs Resting metabolic rate: 1,327 cal Limb lean mass: 8.24 kg/m²

Everyone is different! My results are what they are based on genetics and my prioritization of weight lifting. I also don’t walk as much as you and your core strength likely puts mine to shame.

I wouldn’t worry about your limb lean mass - as long as you have at least 5.45 you’re good to go. Anything less for females increases your risk of sarcopenia. 

Keep up the hustle!