1st the book isn't expensive...but I think you've missed my point. If you aren't speaking her love languages...she may never be ready to work with you on this, because that incentive isn't there for her.
Speaking someone's love languages correctly to them can foster that lovong feeling necessary for her to open up, to want to try something just because you asked her to...it can also help open her mind up to things she didn't know she might be curious about.
You are currently in a spot all of us have found ourselves in, feeling pretty hopeless.
Your W may also be someone who truly doesn't have (or recognize)that spark of sexual desire....before you get her aroused. For many LD's this is a difficult thing for them to overcome...it's hard for them to think about having sex when they don't have that horney feeling. They often feel like they have to have raging hormones to go there. Fact is some people don't get aroused intil the process is already happening for awhile....and that is ok.
Oh...and her withholding info from you, is a lie of omission. Before you two can be intimate sexually you are going to have to tackle your communication problems. She's not opening up to you verbally & emotionally...that has to happen she's probably not likely to open up sexually until that is tackled first.
The book I recommended to you has a test for you both in the back of it, to identify each of your love languages. Ask her to take it for fun...to see if you picked the right answers for her....have her do the same for you (and each of you take your proper tests too). Then see if she'd be willing to have a light discussion about the results.
My H was willing to do this because I kept it fun...but it gave me the opportunity to specify things for him...and while I listened to his examples of what fit into the categories he chose for himself I found better ways to speak his love languages too. Heck ask your MC about the book.