Is 5kg the maximum norm, for a lady to lift?

I recently completed a box lifting course. A petite female come over to me that done it earlier, she asled me, how did i find the box lifting. I said fine, she said to me, she couldn't lift anything, she is a weakling, the maximum she can lift is 5kg. She is in her mid 30's. Is this too weak for a lady that age or is it the norm.

For some reason she often tells me how weak she is, like once , she collected a file off site, told me to feel the weight of it that it was very heavy. I could lift it but I could tell she was anxious I would find it easy so I just said it was heavy alright.

Another time she asked me to do a complex task as she had previously asked another girl to do the last 3 and if she asked her again she would beat her, she was genuinely concerned. I said yeah, she said thanks and again mentioned that the other girl would beat her.
Is this lady too weak or the norm.
No other girl has discussed with me their physical strength so not sure
Is 5kg the maximum norm, for a lady to lift?
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