@Boatman,
Here is the best advice I can give (I am a widow)...
I do not know ALL of your situation's details, but I know what I would want in a new partner if I were to find one. She is feeling a lot of guilt and confusion right now. She wants to love and be loved again, but she has a lingering feeling in the back of her mind that by loving someone else, that she is betraying her deceased spouse, someone she loved and who loved her back. The best thing to do is not be harsh with her, instead, support her. This will mean more to her than you can imagine. Try these...this is what I would like:
1. Let her talk about him when she needs to. Of course, not during an intimate moment between the two of you, but in normal conversation.
2. Do not insist that she put away the pictures. Let her do it when/if she is ready. Instead, add some pictures of you and her together. Adding is a loving move, replacing will make her feel guilty.
3. Allow her to mourn on those "special" days...birthdays, anniversaries, death days. If she wants to be alone, that is a great day for you to go play golf. If she wants you there, let her cry and offer to get some takeout.
4. Accompany her to the cemetery if she would like. Hold her while she cries. Smile when she talks fondly about him.
5. Remember, this man helped shape the woman she has become, the woman that you love. If it wasn't for him, she wouldn't be the woman she is today.
I cannot stress to you how much all this will mean to her and how much all this will make her realize how much you really care about her. She may be surprised in the beginning, but if you keep it consistent, she will realize what a gem she has found, and she won't let you go. If she is the lovely person that you think she is, she probably has a big heart with plenty of room for both of you.
You can try reading this, it might give you some more insight of what widows go through when we decide to date again:
http://widowchick.blogspot.com/2010/08/be-patient-loveim-trying-to-make-some.html