My abandoned child came looking for me - Woman cries out

God please forgive me, but what shall I do?
I got pregnant in secondary school and had a
baby, but abandoned her in the hospital ward and
ran away after I had given birth to her. My then
boyfriend who impregnated was called by the
hospital management and he went and claimed
the child. She grew up under his care till she
became an undergraduate recently.

But right now, my love child has found me after so
many years, even though I never made contact
with her; she's complaining bitterly that her step-
mother is mistreating her and because she's no
longer comfortable living with her father and his
wife, she wants to come and start living with me-
her biological mother.
But accepting her proposal hasn't been easy for
me because my husband doesn't know I had a
baby before we married, I never told him about
that aspect of my past so he believed I was a free
single girl when he married me.
Am so heart-broken right now, I don't know how
to handle this issue so it doesn't get messy and
affect my marriage and new family. Please
brothers and sisters in the house kindly chip in a
word of advise for me; I know I made a mistake
by having her at first, but don't want to
complicate issues now by introducing her into my
new family.