Is there anything wrong with showing up on your parent's door step with gifts?

Generally, the best way to make first contact is privately, in written form or at most a phone call. The other person deserves time to process their emotions, make a decision for themselves and give their consent to further contact. Showing up on someone's doorstep unannounced robs them of the opportunity to choose for themselves how to proceed and shows a lack of respect for their boundaries and feelings. If you have her address, send a certified letter with signature confirmation and return receipt, introduce yourself, tell her what you are looking for, and give her the info she needs to contact you with her answers. Patience is not easy, but it is respectful and kind.Best wishes to you. We do love to hear of happy reunions on here. And we can help you cope with the waiting and uncertainty in the meantime.

I agree with the above, not to mention, it is just generally ocnsidered rude under any circumstance to "just show up unannounced" at someone's house, whom you do not know well. It's also very risky, as you have no idea as to how she will respond to you. Why do that to yourself?