She should be able to unless you're using Unofficial Patch NVSE Plus which has a setting that severely nerfs companions, reducing their damage, resistance, carry weight, etc. This setting is on by default.
Chiming in, I know a setting in one of the dust mods (I think expansion project or dusted dust) limits the carrying capacity of all NPCs, so when they are made companions (either through companion mods or JIP or smth) they can't carry anything. I had to manually setav carryweight of all the companion mods I had.
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Still getting used to this whole "Making mods with actual assets" thing
Repurposing existing assets for her voice.