Should I text my stepdaughter on H's behalf?

H and his 16 y/o daughter had a BAD BAD fight about 2 months ago and there hasn't been any contact between them since. Well at least not any contact that was returned. After about a month my husband texted her when he was at this conference showing her a picture of what he got her. She immediately wrote back "Aww you didn't have to do that"and it went back and forth a few times and then he said "I love you and I'll always be here for you". Then, apparently not realizing who she was talking to, goes "Is this Charlie?" He replies with "This is your dad". She never texted back. So she was carrying on this conversation not knowing who she was talking to. Obviously she must have erased his number and name from her phone because previous to this it always showed up as him.

I have not had any contact with her since then either, but H has asked me to text her to start a conversation. I would text her occasionally before this went down while at work if bored, but other than that never really spoke with her unless she was visiting. She doesn't seem to have a problem with me, but I really don't want to have to be the intermediate. She has a huge problem with H and no matter what I say to her she isn't going to care. She has basically wiped him out of her life and seems perfectly happy with that. He wants me to see if I can get her to talk to him. I'm sure she'll see right through that. Hell, when I took her back to her mom's after the huge fight they had she kept saying "Why are you doing this? Is it because HE told you to do it?" She sees anything I do for her being done because HE told me to.

Should I try texting her to see if I get a response or just tell him that the problems are between them and he needs to find a way to get through to her? He caused this between them. She was no angel either and came here with an attitude from the moment she walked through the door, but he did not act like the adult he should have and screamed just as much as she did. He says, of course, that it's not his fault and once again he's getting blamed for being the bad guy. He needs to apologize to her but I know he won't. He thinks buying her things and sending them to her will do the trick. He's got too much of an ego to take the balme for acting the way he did.