Well I think this is a pretty hard situation tryin to hide your emotions
to this friend , I think firstly you should prepare in case she does reject it .. But you should try to give her more signals that you really really like her , like hugging her appropriately , being nice doing sweet things like getting her something like a flower or something , it doesn’t have to be big , girls cherish the small sweet things , be considerate show her you care , and then if she may show signs of liking you like blushing sometimes when you eg. Call he
pretty , or if everytime shes near you she seems more nervous , though you can directly tell her you love her , take her somewhere private and comfortable like under a nice tree or a calm beautiful place , then start off by telling her how you feel about her , then ask her if she likes you too , she may say yes bt she can also say no , if she does reject you , don’t worry you can still win her , but definitely don’t pressure her or straight away kiss her , unless shes leaning in and looking into your eyes , be confident and maybe brush away a piece of stranded hair and look into her eyes , if she doesn’t like you , you can still be a friend to her and as lots of relationships come from friendship this can blossom into a relationship , but don’t feel bad about yourself if she doesn’t like you more than a friend , being a friend is important too .. Good luck :)