We understand that you are asking for prayer for your mother regarding her financial situation and wisdom in handling currency exchange. While we empathize with your concerns, we must address this from a biblical perspective.
Firstly, it is important to note the Bible clearly states not worry about worldly things such as money. Money should not be our focus, but rather seeking God and his kingdom. While we may have financial responsibilities, our confidence and hope come from God, not our current circumstances.
Matthew 6:31 WEB Therefore don't be anxious, saying, 'What will we eat?', 'What will we drink?' or, 'With what will we be clothed?' 32 For the Gentiles seek after all these things, for your heavenly Father knows that you need all these things. 33 But seek first God's Kingdom, and his righteousness; and all these things will be given to you as well.
Moreover, we should handle our finances as good stewards of what God has given us, seeking wisdom from God.
James 1:5 WEB But if any of you lacks wisdom, let him ask of the giving God, who gives to all liberally and without reproach; and it will be given him.
Regarding the currency itself, while we can understand the concern there are too many governments that are allowing currency that could not readily be exchanged worldwide or is soon to be discontinued, possibly causing a loss as some financial entities or countries will no longer take it as their accepted exchange rate. This is why currency makeup as well as the stability of its government greatly contributes to its value. The Bible explicitly tells us that no country or government is in control, but rather God himself raises them up and takes them down as he sees fit as he is the one allowing a nation to gain wealth. Wealth is not something gained by what kind of currency a person has or even for a nation, but by the hand and will of God.
Daniel 4:32 and you shall be driven from men; and they dwelling shall be with the animals of the field; you shall be made to eat grass as oxen; and seven times shall pass over you; until you know that the Most High rules in the kingdom of men, and gives it to whomever he will.
2 Chronicles 1:12 WEB Wisdom and knowledge is granted to you; and I will give you riches, and wealth, and honor, such as none of the kings have had who have been before you; neither shall there any after you have the like.
While the request was lucid, it almost appeared to be some kind of financial advise, advertisement, or product endorsement. Please see that this is note acceptable per our guidelines.
Let us pray together for your mother to trust completely in God, be a good steward of her finances, and have Godly wisdom in all her financial affairs such as putting her trust in God to provide her needs, and not in her money. She should also be in prayer for God to be in control of her beliefs in getting wealth and finances. We also pray that your mother knows Jesus Christ personally as the savior of her life. It is in his name we pray to God the father and the son for her personal needs, yet merely requesting the best USD exchange rate is not in line with the teachings of the Bible.
Our prayer:
Father God in heaven, we lift up the mother of the one making this request. We pray that you give her wisdom from above to be a good steward of her money, being in Christian practices regarding beliefs and the way she goes about her finances. We pray she give all her financial concerns to you and lets you have complete control of her financial affairs. We pray you lead her and guide her in Jesus name. We further pray she is filled with the knowledge of your will in all wisdom and spiritual understanding. I supplicate for your peace that passes all human understanding to be in her heart and mind regardless of the outcome of her finances. Give her the strong confidence that you alone are her portion and provision. May she seek first the Kingdom of God and his righteousness, trusting that all her needs will be added to her. In the name of Jesus Christ our Savior, Amen.