Sick guppy?

Razaan

New Fish
Oct 7, 2017
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#1
My black guppy just recently gave birth.after giving birth she was very thin and will not eat. then a day after that she would come up to the top to eat when i put food but she will just swim away. Now she looks very thin and i am worried she might die. I have no medicine becuse it is currently out of my budget and also a sunset female died the same way
What should i do?
the tank is fully cycled and just did a water change 2 days before that. i have fast growing live plats
And i feed the vegetebles, brineshrimp flakes, spirrulina flakes, bulk tropical fish flakes, homemade gel food.