Reddit mentions of English Grammar for Students of Spanish: The Study Guide for Those Learning Spanish, 7th edition – Learn Spanish (O & H Study Guides)

Yes, it does really help. I don't know if you're UK or US, but in the UK until recently formal grammar wasn't really taught, so tell us to conflugate our preterite influentives in the plus-perfect tense and we're all at sea.

This book was made just for us sorts - those who can speak fluently (obvs) but don't know why grammar is grammar.

https://www.amazon.co.uk/English-Grammar-Students-Spanish-Guides/dp/0934034419/ref=pd_sbs_14_t_0/258-0721930-0571909?_encoding=UTF8&pd_rd_i=0934034419&pd_rd_r=7e08d1cf-fde3-43a3-883a-af23f346e11e&pd_rd_w=W3qxf&pd_rd_wg=DicMs&pf_rd_p=e44592b5-e56d-44c2-a4f9-dbdc09b29395&pf_rd_r=RHJYHC67SYED540P9T75&psc=1&refRID=RHJYHC67SYED540P9T75

After that, it won't seem so strange when you're told about rules for using gerund and where your subjects/objects have to be.

Depending on what language you want to learn, there may be a book that explains the grammar you'll need for that language by connecting it to English. For example: German,
Spanish, Russian.

If there's a term that you're unfamiliar with, you can also poke around on Wikipedia to get a better idea behind some of the concepts. But when things get too technical, just keep looking up unfamiliar terminology and you'll be on your way.

For a little bit of fun, check out:
Split Ergativity,

where you can see this gem of a sentence:
>An example of split ergativity conditioned by tense and aspect is found in the Hindustani language (Hindi/Urdu), which has an ergative case on subjects in the perfective aspect for transitive verbs in the active voice, while in other aspects (habitual, progressive) subjects appear in the nominative case.

Maybe ask her to provide you lots of examples for each grammar point. And don't be afraid to ask what she means by all those grammar terms. It's easy to get lost in terminology.

Also maybe this book might help (English Grammar for Students of Spanish by Emily Spinelli):

https://www.amazon.com/English-Grammar-Students-Spanish-Learning/dp/0934034419/ref=sr_1_1?crid=1Y5C2K45EVMRF&keywords=english+grammar+for+students+of+spanish&qid=1567427023&s=gateway&sprefix=english+gramma%2Caps%2C212&sr=8-1

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Edit: openlibrary link:

https://openlibrary.org/books/OL858662M/English_grammar_for_students_of_Spanish