Thank you for your query on Healthcare Magic.
Her weight 7 kg at present means she is malnourished and underweight.
Aso titer is a nonspecific test as such and it is suggestive of a previous streptococcal infection
and it may not give any clue in this age group with out any relevant clinical problems.
She needs thorough evaluation for her underweight, inability to walk for longer distances like underlying any chronic problems like celiac disease
, infections like tuberculosis
, retrovirus, or any underlying chronic lung or cardiac conditions.
So refer the child to a Pediatrician
for her nutritional status and for investigations.
Hope I have answered your query.