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If my mother’s sister and my fathers brother have a have a daughter, how close will her DNA be to mine? Would we be as close as half siblings?

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According to PaternityUSA's sibling DNA test page, there is not much difference in the amount of DNA between half siblings & cousins, and so a sibling relational test is not a good choice for this situation. There are other more involved test such as a family reconstruction DNA test that may be able to give you the answers you need. You may be able to call them at perhaps they can direct you towards a test that would.

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https://lmgtfy.com/?q=double+first+cousin+dna takes me to (first hit) https://genetics.thetech.org/ask-a-geneticist/double-cousins-share-one-quarter-their-dna, which looks like it answers your question.

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