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First of all, please make sure you are not being scammed. See HERE. Ghana is the epicenter of such "romance scams" and your situation sounds like it may be one.
Anyhow, assuming this is bona fide, then only the following states in Texas allow proxy marriages: Texas, Colorado, Kansas, and Montana. Out of these states, only Montana allows double-proxy marriages. This means that one of you have to be present in Texas, Colorado, or Kansas to marry. However Montana will allow a proxy to stand in for both.
However - again - please make sure you are not being scammed! This sounds like a scam. Please note: If I tell you simply what you wish to hear, this would be unfair to you. I need to be honest with you and sometimes this means providing information that is not optimal. Negative ratings are reserved for experts who are rude or for erroneous information. Please rate me on the quality of my information; do not punish me for my honesty.
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Hello again. This is a courtesy check in to see if you needed anything else in regards ***** ***** question because you never responded or replied positively. I am simply touching base. Let me know. Thanks!